Библиотека института физики им. Л.В. Киренского СО РАН

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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Malakhovskii A. V., Sokolov V. V., Karimov D.N.
Заглавие : Nature of magnetic circular dichroism and absorption spectra of f-f transitions in Na0.4Ho0.6F2.2 single crystal
Колич.характеристики :5 с
Место публикации : Chem. Phys. - 2024. - Vol. 581. - Ст.112257. - ISSN 03010104 (ISSN), DOI 10.1016/j.chemphys.2024.112257. - ISSN 18734421 (eISSN)
Примечания : Cited References: 25
Аннотация: We present first study of magnetic circular dichroism (MCD) spectra of Ho3+ ion in C4v local symmetry, which it has in fluorite Na0.4Ho0.6F2.2. Optical absorption and MCD spectra were studied in this single crystal in the region of 5I8 5F3, 5F2, 3K8 and 5G5 transitions in the temperature range 3.6–––90 K. It was revealed, that number of transitions observed in the MCD and absorption spectra coincides with the number of transitions only from the doublet E state to singlet excited states. The E-E type transitions are not active in MCD, but they are not observed in the absorption spectra either. Paramagnetic magneto-optical activities (MOA) of the absorption bands and their temperature dependences were measured and interpreted with the help of the theory based on the nature of f-f transitions allowance. The MCD spectra were also analyzed in approximation of the J,±MJ wave functions of the free atom. It was shown in particular, that the lowest initial state of the transitions observed at T ˃ 10 K had MJ = 7, but this is not the lowest state of the holmium ion in the crystal. A little lower there is a quasi-doublet with MJ = 8 and, accordingly, with a higher magneto-optical activity of transitions from it. However, the intensity of transitions from this state is low.
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Вид документа : Статья из журнала
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Автор(ы) : Samoshkina Yu. E., Rautskii M. V., Neznakhin D. S., Stepanova E. A., Edelman I. S., Chou, Hsiung
Заглавие : Particles–matrix bond in ZnCoO:H and ZnCoAlO:H films: Issues of magnetism and spin injection
Место публикации : Materials. - 2023. - Vol. 16, Is. 10. - Ст.3659. - ISSN 19961944 (eISSN), DOI 10.3390/ma16103659
Примечания : Cited References: 45. - This work was supported by the Russian Science Foundation [grant number 21-72-00061]
Аннотация: ZnCoO:H and ZnCoAlO:H films were synthesized by radio frequency magnetron sputtering in a (1 − x)Ar + xH2 mixed atmosphere with x = 0.2–0.5. The films contain different amounts of metallic Co particles (from 7.6% and higher) ~4–7 nm in size. The magnetic and magneto-optical (MO) behavior of the films was analyzed in combination with their structural data. The samples exhibit high values of magnetization (up to 377 emu/cm3) and MO response at room temperature. Two situations are considered: (1) the film magnetism is associated only with isolated metal particles and (2) magnetism is present both in the oxide matrix and in metal inclusions. It has been established that the formation mechanism of the magnetic structure of ZnO:Co2+ is due to the spin-polarized conduction electrons of metal particles and zinc vacancies. It was also found that in the presence of two magnetic components in the films, these components are exchange-coupled. In this case, the exchange coupling generates a high spin polarization of the films. The spin-dependent transport properties of the samples have been studied. A high value of the negative magnetoresistance of the films at room temperature (~4%) was found. This behavior was explained in terms of the giant magnetoresistance model. Thus, the ZnCoO:H and ZnCoAlO:H films with high spin polarization can be considered as sources of spin injection.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Samoshkina Yu. E., Edelman I. S., Chou, Hsiung, Petrov D. A., Zharkov S. M., Neznakhin, Dmitry, Stepanova, Elena, Stepanov, Andrey
Заглавие : Magnetic circular dichroism of Co nanoparticles localized in matrices of various types
Место публикации : Materialia. - 2023. - Vol. 28. - Ст.101759. - ISSN 25891529 (eISSN), DOI 10.1016/j.mtla.2023.101759
Примечания : Cited References: 28. - This work was supported by the Russian Science Foundation [grant number 21-72-00061]. Electron microscopic studies were carried out in the laboratory of electron microscopy of the Joint Scientific Center of the Siberian Federal University
Аннотация: Magnetic and magneto-optical properties of cobalt nanoparticles (Co-NPs) dispersed in a transparent dielectric SiO2 and semiconductor ZnO matrices have been investigated. Field and temperature dependences of the samples magnetization showed the typical behavior of an ensemble of superparamagnetic particles with a blocking temperature near and below room temperature. The spectroscopy of magnetic circular dichroism (MCD) in the visible and near-infrared light ranges has revealed a significant difference between the behavior of the Co-NPs and a solid Co film. It has been found that the MCD spectrum shape for the Co-NPs does not depend on the matrix type. The room temperature magneto-optical activity of the Co-NPs in the different matrices has been estimated as an indicator for practical applications.
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Вид документа : Статья из журнала
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Автор(ы) : Boldyrev K. N., Diab M., Gudim I. A., Popova M. N.
Заглавие : Optical linear dichroism in the ab-plane of NdFe3(BO3)4 ferroborate
Колич.характеристики :6 с
Место публикации : J. Exp. Theor. Phys. - 2023. - Vol. 137, Is. 4: Special Issue dedicated to the 95th Anniversary of L. A. Prozorova. - P.486-491. - ISSN 10637761 (ISSN), DOI 10.1134/S1063776123100011. - ISSN 10906509 (eISSN)
Примечания : Cited References: 16. - This study was supported by the Ministry of Science and Higher Education (project no. FFUU-2022-0003) and partially (K.N. B., dichroism measurements) by the Russian Science Foundation (grant no. 19-72-10132P)
Аннотация: The high-resolution optical absorption spectra of NdFe3(BO3)4 single crystals have been recorded at temperatures from 4 to 40 K in the IR range of f–f transitions in a Nd3+ ion. Light linearly polarized at different angles to the C2 axes in the basal plane has been passed along the trigonal C3 axis. Below the temperature of magnetic moment ordering into a collinear antiferromagnetic structure (TN ≈ 30 K), dichroism, that is, the absorption versus polarization dependence, arises. The temperature and angular dependences of dichroism indicate that the magnetic moments of iron are directed along the C2 axes up to about 17 K, the number of domains with variously directed C2 axes being different. The mechanism of linear dichroism has been discussed. Below 17 K, a smooth transition to the helicoidal magnetic phase has been observed, with the collinear phase coexisting with the helicoidal one. Data presented in this article contradict the earlier concept of magnetic moments fluctuating in the low-temperature phase near the C2 axis within the ±10° interval.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Malakhovskii A. V., Sokolov V. V., Sukhachev A. L., Gudim I. A.
Заглавие : Magnetic circular dichroism of f-f transitions in multiferroic antiferromagnet Ho0.75Nd0.25Fe3(BO3)4
Коллективы : "Functional materials", International conference, Крымский федеральный университет имени В.И. Вернадского
Место публикации : Ovchinnikov S. G. International conference "Functional materials": book of abstracts/ ed. V. N. Berzhansky ; org. com. S. G. Ovchinnikov [et al.]. - Simferopol, 2023. - P.100-101
Примечания : Cited References: 2
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Вид документа : Статья из журнала
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Автор(ы) : Samoshkina Yu. E., Petrov D. A., Chou H.
Заглавие : Low-hydrogenated ZnCoAlO films: structure, magneto-optical and magnetic behavior
Место публикации : Appl. Phys. A. - 2022. - Vol. 128, Is. 6. - Ст.519. - ISSN 09478396 (ISSN), DOI 10.1007/s00339-022-05665-z
Примечания : Cited References: 16. - This research was funded by the Russian Science Foundation Grant No. 21-72-00061
Аннотация: Morphology, chemical composition, crystal structure, and magnetic circular dichroism of ZnO films doped simultaneously with Co and Al (CAZO) have been studied. The films were deposited on glass substrates by the RF magnetron sputtering of the Zn0.93Co0.05Al0.02O target. Low hydrogen concentrations of 1–4% were used in mixed Ar + H2 atmosphere together with high enough substrate temperature of 450 °C. A tendency to a decrease in the Zn amount and an increase in the relative Co and Al content in the films has been revealed in the presence of hydrogen in the atmosphere. The structural data of the studied films correlate well with those for high-hydrogenated (20–50% H2) CAZO films deposited under the same conditions and studied earlier. The new data indicate the prospect of obtaining ferromagnetic samples based on ZnO without any secondary phases.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Samardak, Alexander S., Ognev, Alexey, V, Kolesnikov, Alexander G., Stebliy, Maksim E., Samardak, Vadim Yu, Iliushin, Ilia G., Pervishko, Anastasiia A., Yudin, Dmitry, Platunov M. S., Ono, Teruo, Wilhelm, Fabrice, Rogalev, Andrey
Заглавие : XMCD and ab initio study of interface-engineered ultrathin Ru/Co/W/Ru films with perpendicular magnetic anisotropy and strong Dzyaloshinskii-Moriya interaction
Коллективы : Russian Ministry of Science and Higher Education [075-15-2021-607, 0657-2020-0013]; Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR) [19-32-60020]; Russian Federation President Scholarship for Young Scientists [SP-1640.2021.5]; Russian Science FoundationRussian Science Foundation (RSF) [21-42-00041]; Russian Ministry of Science and Higher Education
Место публикации : Phys. Chem. Chem. Phys. - 2022. - Vol. 24, Is. 14. - P.8225-8232. - ISSN 1463-9076, DOI 10.1039/d1cp05456b. - ISSN 1463-9084(eISSN)
Примечания : Cited References: 47. - A. V. O., I. G. I. and T. O. thank the Russian Ministry of Science and Higher Education for state support of scientific research conducted under the supervision of leading scientists in Russian institutions of higher education, scientific foundations and state research centers (Project No. 075-15-2021-607) in parts of sample preparation and its magnetic characterization. The micromagnetic simulations performed by M. E. S. were supported by the Russian Ministry of Science and Higher Education under the state task (0657-2020-0013). A. A. P. (ab initio calculations) acknowledges the support from the Russian Foundation for Basic Research (Project No. 19-32-60020) and the Russian Federation President Scholarship for Young Scientists (SP-1640.2021.5). The work of A. S. S. related to the experimental and analytical study of DMI and skyrmion bubbles was supported by the Russian Science Foundation (Project No. 21-42-00041). The authors acknowledge the use of computational resources of the Skoltech supercomputer Zhores47 to obtain the theoretical results presented in this paper. The authors thank ID12 beamline staff for their help during the XMCD experiment and gratefully acknowledge the provision of beamtime (Proposal MA-3661) by the ESRF. The research contribution of M. P. (XMCD anaysis) was partially funded by the Russian Ministry of Science and Higher Education via the budget project of SRF SKIF, Boreskov Institute of Catalysis
Предметные рубрики: TOTAL-ENERGY CALCULATIONS
CIRCULAR-DICHROISM
MOLECULAR-DYNAMICS
Аннотация: Understanding the nature of recently discovered spin–orbital induced phenomena and a definition of a general approach for “ferromagnet/heavy-metal” layered systems to enhance and manipulate spin–orbit coupling, spin–orbit torque, and the Dzyaloshinskii–Moriya interaction (DMI) assisted by atomic-scale interface engineering are essential for developing spintronics and spin-orbitronics. Here, we exploit X-ray magnetic circular dichroism (XMCD) spectroscopy at the L2,3-edges of 5d and 4d non-magnetic heavy metals (W and Ru, respectively) in ultrathin Ru/Co/W/Ru films to determine their induced magnetic moments due to the proximity to the ferromagnetic layer of Co. The deduced orbital and spin magnetic moments agree well with the theoretically predicted values, highlighting the drastic effect of constituting layers on the system's magnetic properties and the strong interfacial DMI in Ru/Co/W/Ru films. As a result, we demonstrate the ability to simultaneously control the strength of magnetic anisotropy and intermixing-enhanced DMI through the interface engineered inversion asymmetry in thin-film chiral ferromagnets, which are a potential host for stable magnetic skyrmions.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Sokolov V. V., Malakhovskii A. V., Sukhachev A. L., Gudim I. A.
Заглавие : Magnetic circular dichroism and absorption of a HoAl3(BO3)4 crystal in the region of 5I8 → 5I3 and 5F2 transitions
Коллективы : Российская академия наук, Физико-технический институт им. Е.К. Завойского ФИЦ Казанского научного центра РАН, Казанский (Приволжский) федеральный университет, Euro-Asian Symposium "Trends in MAGnetism", "Trends in MAGnetism", Euro-Asian Symposium
Место публикации : VIII Euro-Asian symposium "Trends in magnetism" (EASTMAG-2022): Book of abstracts/ program com. S. G. Ovchinnikov [et al.]. - 2022. - Vol. 1, Sect.: Magnetotransport, magnetooptics and magnetophotonics. - Ст.D.P16. - P.470-471. - ISBN 978-5-94469-051-7
Примечания : Cited References: 4
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Вид документа : Статья из журнала
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Автор(ы) : Solodova O. V., Sokolov A. Е., Ivanova O. S., Volochaev M. N., Lapin I. N., Goncharova D. A., Svetlichnyi V. A.
Заглавие : Magneto-optical properties of nanoparticle dispersions based on Fe3O4, obtained by pulse laser ablation in a liquid
Место публикации : Phys. Solid State. - 2022. - Vol. 64, Is. 14. - P.2292-2299. - ISSN 10637834 (ISSN), DOI 10.21883/PSS.2022.14.54331.147. - ISSN 10906460 (eISSN)
Примечания : Cited References: 39. - The authors would like to thank Dr. Phys.-Math. Sci., Professor I.S. Edelman for participating in the discussion of the study results and significant comments when writing the article. This study was supported by the Russian Foundation for Basic Research, grant No. 19-52-52002
Аннотация: The structure, optical and magneto-optical properties of colloidal solutions of iron oxide nanoparticles obtained by pulsed ablation in distilled water, both without additives and with various functional additives: gold-hydrochloric acid, silicon oxide, and polyvinylpyrrolidone, have been studied. It is shown that the main magnetic phase is magnetite Fe3O4. The size distribution of nanoparticles and the degree of their agglomeration depend on the additives. In the absence of the latter, a very wide of size distributions and strong agglomeration of particles are observed. The narrowest distribution curve with a maximum corresponding to ~7 nm and an almost complete absence of agglomeration are observed for particles synthesized in the presence of polyvinylpyrrolidone. The shape of the spectral dependence of magnetic circular dichroism, which generally corresponds to the spectrum of magnetite, undergoes some modifications for various additives, which is associated with defects in the distribution of iron ions between different positions in the crystal.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Edelman I. S., Ivantsov R. D., Lin C. -R., Zharkov S. M., Velikanov D. A., Molokeev M. S., Zeer G. M., Chen Y. -Z., Spivakov A. A.
Заглавие : Evolution of morphology and magnetic properties of α-Fe2−xCrxO3 nanoparticles in dependence on Cr concentration
Место публикации : J. Magn. Magn. Mater. - 2022. - Vol. 564. - Ст.170101. - ISSN 03048853 (ISSN), DOI 10.1016/j.jmmm.2022.170101
Примечания : Cited References: 69. - The work was supported financially by the Russian Foundation for Basic Research, Grant № 19-52-52002 and Ministry of Science and Technology of Taiwan, Grants MOST № 108-2923-M-153-001-MY3, № 110-2811-M-153-001 and № 110-2112-M-153-005. The support was obtained also from the Joint Scientific Center of the Siberian Federal University supported by the State assignment (#FSRZ-2020-0011) of the Ministry of Science and Higher Education of the Russian Federation, where the electron microscopy studies were carried out
Аннотация: Hematite, α-Fe2O3, one of the most widely studied magnetic compounds known to mankind since ancient times, has amazing properties and continues to puzzle researchers to this day. In this work, we found exceptionally strong changes in the morphology and magnetic properties of hematite nanoparticles upon doping with rather low concentrations of chromium. Nanoparticles α-Fe2−xCrxO3 with x varied from zero to 0.15 were prepared by solvothermal method using FeCl3·6H2O, CrCl3·6H2O, and 1,2-diaminopropane, (CH2)3(NH2)2, as precursors and temperature 180 °C for 6 h. The X-ray diffraction data showed the presence of only one crystal phase α-Fe2O3 for all x meanings with growing average crystalline size as the x increases. For the parent α-Fe2O3 powdered samples, the transmission electron microscopy revealed very long narrow nanorods with rounded ends that transform into spindles of increasing volume and cross section diameter as the Cr concentration increases. Vibrating sample magnetometry (VSM) and magnetic circular dichroism (MCD) study of the nanoparticles behavior in dependences on temperature and magnetic field revealed many unusual peculiarities. Among them there are strong increase of NPs magnetization with x increase (usually opposite picture is observed), the Morin transition temperature TM dependence on magnetic field, VSM sees the Morin transition in samples with small x only while MCD – in all samples, magnetization field dependences also are different when measured with VSM and MCD, and so on. Qualitative considerations were proposed to explain the observed phenomena.
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ivantsov R. D., Lin C. -R., Ivanova O. S., Altunin R. R., Knyazev Yu. V., Molokeev M. S., Zharkov S. M., Chen Y. -Z., Lin E. -S., Chen B. -Y., Shestakov N. P., Edelman I. S.
Заглавие : Mossbauer and MCD spectroscopy of the Fe3S4 nanoparticles synthesized by the thermal decomposition method with two different surfactants
Место публикации : Curr. Appl. Phys. - 2021. - Vol. 25. - P.55-61. - ISSN 15671739 (ISSN), DOI 10.1016/j.cap.2021.02.013
Примечания : Cited References: 30. - The reported study was funded by Joint Research Project of Russian Foundation for Basic Research № 19-52-52002 and Ministry of Science and Technology, Taiwan MOST № 108-2923-M-153-001-MY3 and № 106-2112-M-153-001-MY3 , and by Russian Foundation for Basic Research with Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science , the research project number 19-42-240005 : “Features of the electronic structure, magnetic properties and optical excitations in nanocrystals of the multifunctional magnetic chalcogenides Fe3S4 and FeSe”. The electron microscopy and electron diffraction investigations were conducted in the SFU Joint Scientific Center supported by the State assignment (#FSRZ-2020-0011) of the Ministry of Science and Higher Education of the Russian Federation. The thermal-gravity measurements were carried out with the differential Scanning Calorimeter DSC 204 F-1 Phoenix (NETZSCH) in the Krasnoyarsk Regional Center of Research Equipment of Federal Research Center «Krasnoyarsk Science Center SB RAS»
Аннотация: Greigite (Fe3S4) nanoparticles (NPs) were fabricated by the thermal decomposition method using two different surfactants: oleylamine (OLA) and 1-hexadecylamine (HDA). In both cases, the synthesized NPs were characterized as the Fe3S4 nanocrystals with minor inclusions of Fe9S11 phase. FT-IR spectroscopy and thermo-gravimetric analysis allow concluding about OLA or HDA shells covering magnetic core of NPs. Mossbauer spectra has revealed deviations of iron ions distribution among crystal positions from that presented in literature for pure greigite. In accordance with these deviations, the pronounce changes are observed in the magnetic circular dichroism (MCD) spectra which manifest themselves as the spectrum shift to higher energies of electromagnetic waves and redistribution of the MCD maximum intensities. These effects are associated with a change in the density of electronic states in the samples due to the redistribution of iron ions between octahedral and tetrahedral positions in nanocrystals under the influence of surfactants.
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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kazak N. V., Platunov M. S., Knyazev Yu. V., Molokeev M. S., Gorev M. V., Ovchinnikov S. G., Pchelkina Z. V., Gapontsev V. V., Streltsov S. V., Bartolome J., Arauzo A., Yumashev V. V., Gavrilkin S. Y., Wilhelm F., Rogalev A.
Заглавие : Spin state crossover in Co3BO5
Место публикации : Phys. Rev. B. - 2021. - Vol. 103, Is. 9. - Ст.094445. - ISSN 24699950 (ISSN), DOI 10.1103/PhysRevB.103.094445
Примечания : Cited References: 71. - We acknowledge many inspirational discussions on the topic of this paper with the late Natalia Ivanova and Leonard Bezmaternykh. The authors acknowledge A. Ney for allowing us to use the XANES spectrum of film. We are grateful to the Russian Foundation for Basic Research (Project No. 20-02-00559) and President Council on Grants (Project No. МК-2339.2020.2) for supporting this paper. This paper was carried out within the state assignment of the Russian Ministry of Science and High Education via program “Quantum”' (No. AAAA-A18-118020190095-4). We also acknowledge support by Russian Ministry of Education and Science via Contract No. 02.A03.21.0006. We acknowledge financial support from the Spanish Ministry of Economy, Industry and Competitiveness (MINECO, Grant No. MAT2017-83468-R) and from the regional Government of Aragon (E12-20R RASMIA project)
Аннотация: We have investigated the spin and oxidation states of Co in Co3BO5 using x-ray magnetic circular dichroism (XMCD) and dc magnetic susceptibility measurements. At low temperatures, XMCD experiments have been performed at the Co K-edge in Co3BO5 and Co2FeBO5 single crystals in the fully ferrimagnetically ordered phase. The Co (K-edge) XMCD signal is found to be related to the Co2+ magnetic sublattices in both compounds, providing strong experimental support for the low-spin (LS) Co3+ scenario. The paramagnetic susceptibility is highly anisotropic. An estimation of the effective magnetic moment in the temperature range 100–250 K correlates well with two Co2+ ions in the high-spin (HS) state and some orbital contribution, while Co3+ remains in the LS state. The crystal structure of the Co3BO5 single crystal has been solved in detail at the T range 296–703 K. The unit cell parameters and volume show anomalies at 500 and 700 K. The octahedral environment of the Co4 site strongly changes with heating. The generalized gradient approximation with Hubbard U correction calculations have revealed that, at low-temperatures, the system is insulating with a band gap of 1.4 eV, and the Co2+ ions are in the HS state, while Co3+ are in the LS state. At high temperatures (T 700 K), the charge ordering disappears, and the system becomes metallic with all Co ions in 3d7 electronic configuration and HS state.
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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Lyashchenko S. A., Maximova O. A., Shevtsov D. V., Varnakov S. N., Tarasov I. A., Wiedwald U., Rosen J., Ovchinnikov S. G., Farle M.
Заглавие : Optical and magneto-optical properties of epitaxial Mn2GaC MAX phase thin film
Место публикации : J. Magn. Magn. Mater. - 2021. - Vol. 528. - Ст.167803. - ISSN 03048853 (ISSN), DOI 10.1016/j.jmmm.2021.167803
Примечания : Cited References: 39. - The research was supported by the government of the Russian Federation (agreement No. 075-15-2019-1886) and the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) – Project-ID 405553726 – TRR 270. We thank Andrejs Petruhins for preparation of the samples. J. R. acknowledges funding from the Swedish Research Council (VR), project 642-2013-8020
Аннотация: We report measurements of the dielectric permittivity, optical conductivity and magnetic circular dichroism (MCD) of the epitaxial Mn2GaC MAX-phase thin film in an external magnetic field of up to 200 mT, at temperatures of 296 and 140 K and 1.4 to 3.5 eV. The optical conductivity and MCD spectra show absorption peaks which are consistent with the interband electronic transitions for different positions of Mn, Ga, and C ions as confirmed by theoretical calculations of the spin-dependent density of electronic states. The well-known structural phase transition at 214 K is also seen in the changes of optical, magneto-optical and surface magnetic properties of Mn2GaC in our experiment.
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Malakhovskii A. V., Sokolov V. V., Karimov D. N.
Заглавие : Magnetic circular dichroism of 5I8→ 5F3, 5F2 and 3K8 transitions in Na0.4Ho0.6F2.2 single crystal
Место публикации : Opt. Mater. - 2021. - Vol. 114. - Ст.110953. - ISSN 09253467 (ISSN), DOI 10.1016/j.optmat.2021.110953
Примечания : Cited References: 23. - A.V. Malakhovskii and V.V. Sokolov acknowledge the financing of the reported study by the Russian Foundation for Basic Researches grant 19-02-00034 and by the Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science, to the research project: number 19-42-240003 “Influence of the local environment on magneto-optical properties of f-f transitions in rare-earth aluminum and iron borates.” D.N. Karimov acknowledges the financing support by the Ministry of Science and Higher Education of Russia within the State assignment FSRC «Crystallography and Photonics» of Russian Academy of Sciences
Аннотация: We measured optical absorption and magnetic circular dichroism spectra of Na0.4Ho0.6F2.2 single crystal in the region of 5I8→ 5F3, 5F2 and 3K8 transitions in Ho3+ ion at 90 K and room temperature. Paramagnetic magneto-optical activities (MOA) of the transitions were found for these two temperatures and compared with the theory based on the nature of f-f transitions allowance. It was shown that nature of allowance of three considered transitions is different. The MCD spectra were also analyzed in approximation of the |J, ±MJ› wave functions of the free atom and using concept of the crystal quantum number. Using this concept and experimental paramagnetic MOA, we found that MJeff = 2.1 for the initial state of the 5I8→ 5F3 transition.
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15.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Соколов, Валерий Владимирович, Малаховский, Александр Валентинович, Гудим, Ирина Анатольевна
Заглавие : Магнитный круговой дихроизм и поглощение кристалла HoAl3(BO3)4 в области f-f перехода 5I8 → 5S2
Коллективы : "Новое в магнетизме и магнитных материалах", международная конференция, Научный совет по физике конденсированных сред РАН, МИРЭА - Российский технологический университет, Московский государственный университет им. М.В. Ломоносова, Магнитное общество России
Место публикации : Новое в магнетизме и магнитных материалах: сборник трудов XXIV международной конференции/ прогр. ком.: Р. С. Исхаков, С. Г. Овчинников [и др.]. - 2021. - Секция 12: Магнитооптика и фотомагнетизм. - Ст.12-60-63
Примечания : Библиогр.: 3
Аннотация: Работа посвящена изучению спектров поглощения и магнитного кругового дихроизма (МКД) кристалла HoAl3(BO3)4. С помощью спектров МКД определены Зеемановские расщепления линий поглощения. Зеемановские расщепления также вычислены теоретически в приближении волновых функций свободного иона.This work is devoted to the study of the absorption and magnetic circular dichroism (MCD) spectra of the HoAl3(BO3)4 crystal. The Zeeman splitting of the absorption lines was determined using the MCD spectra. Zeeman splittings were also calculated theoretically in the approximation of the wave functions of free ion.
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16.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Малаховский, Александр Валентинович, Гудим, Ирина Анатольевна, Качур И. С., Пирятинская В. Г.
Заглавие : Аномалии поведения магнитного линейного дихроизма и магнитоэлектрическое взаимодействие в HoFe3(BO3)4
Коллективы : "Новое в магнетизме и магнитных материалах", международная конференция, Научный совет по физике конденсированных сред РАН, МИРЭА - Российский технологический университет, Московский государственный университет им. М.В. Ломоносова, Магнитное общество России
Место публикации : Новое в магнетизме и магнитных материалах: сборник трудов XXIV международной конференции/ прогр. ком.: Р. С. Исхаков, С. Г. Овчинников [и др.]. - 2021. - Секция 13: Магнитоэлектрические явления. - Ст.13-30
Примечания : Библиогр.: 3
Аннотация: Исследован магнитный линейный дихроизм (МЛД) перехода 5I8→5F3 в базисной плоскости монокристалла HoFe3(BO3)4 при распространении света вдоль тригональной оси с при температуре 2K в функции от магнитного поля 0-65 кЭ, направленного вдоль с-оси. МЛД – чётная функция магнитных моментов. Однако было обнаружено, что дихроизм между поляризациями вдоль a и b осей в магнитном поле, параллельном тригональной оси c, не только существует в лёгкоосном состоянии кристалла, но и меняет знак при смене знака поля. Таким образом, магнитное поле H||c нарушает аксиальную симметрию магнитной структуры гольмия в изученных возбуждённых состояниях. Мы доказали существование спонтанной электрической поляризации в HoFe3(BO3)4 при 2 K и рассмотрели магнитоэлектрическое взаимодействие, как один из источников нарушения аксиальной симметрии и других особенностей локальных магнитных свойств гольмия.We studied spectra of magnetic linear dichroism (MLD) of 5I8→ 5F3 transition in the basal plane of the HoFe3(BO3)4 single crystal in the light propagated along the trigonal c axis at temperature 2 K as a function of magnetic field 0 – 65 kOe directed along c axis. MLD is an even function of magnetic moments. However it was found, that dichroism between polarizations along a and b axis in the magnetic field parallel to the trigonal c axis not only exists in the easy axis state of the crystal, but it changes sign with the changing of the field sign. Thus, magnetic field H||c violates the axial symmetry of the Ho magnetic structure in the studied excited states. We proved existence of a spontaneous electric polarization in HoFe3(BO3)4 at 2 K and considered magneto-electric interaction as one of the sources of violation of the axial symmetry and of other features of the local holmium magnetic properties.
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Platunov M. S., Gudim I. A., Ovchinnikova, Elena N., Kozlovskaya, Ksenia A., Wilhelm, Fabrice, Rogalev, Andrei, Hen, Amir, Ivanov, Vsevolod Y., Mukhin, Alexander A., Dmitrienko, Vladimir E.
Заглавие : X-ray Natural Circular Dichroism imaging of multiferroic crystals
Коллективы : Russian Science FoundationRussian Science Foundation (RSF) [19-72-00002, 16-12-10531]; Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR) [19-52-12029, 19-02-00483]; Ministry of Science and Higher Education of the Russian Federation within the State assignment FSRC "Crystallography and Photonics" RAS
Место публикации : Crystals. - 2021. - Vol. 11, Is. 5. - Ст.531. - ISSN 2073-4352, DOI 10.3390/cryst11050531
Примечания : Cited References: 70. - This research was funded by the Russian Science Foundation (grant 19-72-00002). K.A.K. acknowledges support from the Russian Foundation for Basic Research (project no. 19-52-12029 and project no. 19-02-00483). V.E.D. was partly supported by the Ministry of Science and Higher Education of the Russian Federation within the State assignment FSRC "Crystallography and Photonics" RAS. V.Y.I. and A.A.M. were supported by the Russian Science Foundation [grant 16-12-10531]
Предметные рубрики: OPTICAL-ACTIVITY
MAGNETOELASTIC PROPERTIES
SINGLE-CRYSTAL
Аннотация: The polarizing spectroscopy techniques in visible range optics have been used since the beginning of the 20th century to study the anisotropy of crystals based on birefringence and optical activity phenomena. On the other hand, the phenomenon of X-ray optical activity has been demonstrated only relatively recently. It is a selective probe for the element-specific properties of individual atoms in non-centrosymmetric materials. We report the X-ray Natural Circular Dichroism (XNCD) imaging technique which enables spatially resolved mapping of X-ray optical activity in non-centrosymmetric materials. As an example, we present the results of combining micro-focusing X-ray optics with circularly polarized hard X-rays to make a map of enantiomorphous twinning in a multiferroic SmFe3(BO3)4 crystal. Our results demonstrate the utility and potential of polarization-contrast imaging with XNCD as a sensitive technique for multiferroic crystals where the local enantiomorphous properties are especially important. In perspective, this brings a novel high-performance method for the characterization of structural changes associated with phase transitions and identification of the size and spatial distribution of twin domains.
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Malakhovskii A. V., Gnatchenko S. L., Kachur I. S., Piryatinskaya V. G., Gudim I. A.
Заглавие : Magnetic linear dichroism and features of the local magnetic structure of HoFe3(BO3)4 single crystal in 5F2 and 5F3 excited states of Ho3+ ion
Место публикации : J. Magn. Magn. Mater. - 2021. - Vol. 536. - Ст.168106. - ISSN 03048853 (ISSN), DOI 10.1016/j.jmmm.2021.168106
Примечания : Cited References: 22. - A.V. Malakhovskii acknowledges the financing of the reported study by the Russian Foundation for Basic Researches grant 19-02-00034 and by the Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science, to the research project: number 19-42-240003 “Influence of the local environment on magneto-optical properties of f-f transitions in rare-earth aluminum and iron borates”
Аннотация: We measured spectra of magnetic linear dichroism (MLD) of 5I8 → 5F2, 5F3 transitions in the basal plane of the HoFe3(BO3)4 single crystal in the light propagated along the trigonal c-axis at temperature 2 K as a function of magnetic field 0 – 65 kOe directed along a and b axes. The substantial anisotropy of the MLD in the basal plane was revealed. The anisotropy of the MLD is strongly different for different electron transitions, that is, the MLD is mainly connected with the excited electron states. Transformations of the MLD spectra permitted us to retrace variations of the Ho ion magnetic moment orientation in different excited electron states as a function of the magnetic field. It was shown that in the excited states the local Ho magnetic moments do not reveal reorientation transitions synchronously with that of the Fe-sublattice. A small splitting of the ground doublet of the Ho3+ ion was observed during certain electron transitions. This means that during these electron transitions the local crystal field can change not only in the excited but in the ground state as well.
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Malakhovskii A. V., Sokolov V. V., Gudim I. A.
Заглавие : Magnetic circular dichroism and absorption spectra of f–f transitions 5I8 → 5F2 and 5F3 in the HoFe3(BO3)4 single crystal
Коллективы : Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR) [19-02-00034]; Krasnoyarsk Krai Russian Foundation for Basic Research; Krasnoyarsk Krai Regional Fund of Science [19-42-240003]
Место публикации : Low Temp. Phys. - 2020. - Vol. 46, Is. 7. - P.734-739. - ISSN 1063-777X, DOI 10.1063/10.0001371. - ISSN 1090-6517(eISSN)
Примечания : Cited References: 16. - The study was supported by the Russian Foundation for Basic Research, grant No. 19-02-00034, and also by the Krasnoyarsk Krai Russian Foundation for Basic Research and the Krasnoyarsk Krai Regional Fund of Science as part of project No. 19-42-240003 on "The influence of the local environment on the magneto-optical properties of f-f transitions in rare-earth aluminoborates and ferroborates"
Предметные рубрики: MAGNETOOPTICAL ACTIVITY
ELECTRON-STRUCTURE
ERFE3(BO3)4
Аннотация: Magnetic circular dichroism (MCD) and absorption spectra of multiferroic HoFe3(BO3)4 of 5I8 → 5F2 and 5F3 f–f transitions are measured at T = 90 K. The absorption spectra are expanded into Lorentzian components, and the transition intensities are obtained. The Zeeman splitting of some transitions is determined using the MCD and absorption spectra. The MCD spectra and Zeeman splitting are theoretically analyzed in the free-atom |J, ±MJ〉wave function approximation by using the concept of a crystalline quantum number. An inconsistency is revealed when this concept is applied to ions with an integer moment, and a modification of the concept is proposed. Anomalously intense vibronic repetitions of electronic transitions from excited sublevels of the ground multiplet are found.
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mitcov D., Platunov M. S., Buch C. D., Reinholdt A., Dossing A. R., Wilhelm F., Rogalev A., Piligkos S.
Заглавие : Hard X-ray magnetochiral dichroism in a paramagnetic molecular 4f complex
Коллективы : VILLUM FONDEN [13376]; Carlsberg FoundationCarlsberg Foundation [CF18-0613]; Independent Research Fund Denmark [9036-00015B]; Russian Science FoundationRussian Science Foundation (RSF) [19-72-00002]
Место публикации : Chem. Sci. - 2020. - Vol. 11, Is. 31. - P.8306-8311. - ISSN 2041-6520, DOI 10.1039/d0sc02709j. - ISSN 2041-6539(eISSN)
Примечания : Cited References: 74. - SP thanks the VILLUM FONDEN for research grant 13376. SP and DM thank the Danish Ministry of Higher Education and Science for travel support through the Instrument Center DANSCATT. AR thanks the Carlsberg Foundation (grant CF18-0613) and the Independent Research Fund Denmark (grant 9036-00015B) for funding. MP thanks the Russian Science Foundation (grant 19-72-00002) for funding
Предметные рубрики: CHIRAL DICHROISM
SINGLE-CRYSTAL
SPIN QUBITS
READ-OUT
L3-EDGE
Аннотация: Magnetochiral dichroism (MΧD) originates in the coupling of local electric fields and magnetic moments in systems where a simultaneous break of space parity and time-reversal symmetries occurs. This magnetoelectric coupling, displayed by chiral magnetic materials, can be exploited to manipulate the magnetic moment of molecular materials at the single molecule level. We demonstrate herein the first experimental observation of X-ray magnetochiral dichroism in enantiopure chiral trigonal single crystals of a chiral mononuclear paramagnetic lanthanide coordination complex, namely, holmium oxydiacetate, at the Ho L3-edge. The observed magnetochiral effect is opposite for the two enantiomers and is rationalised on the basis of a multipolar expansion of the matter–radiation interaction. These results demonstrate that 4f–5d hybridization in chiral lanthanoid coordination complexes is at the origin of magnetochiral dichroism, an effect that could be exploited for addressing of their magnetic moment at the single molecule level.
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