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    Uniaxial anisotropy and low-temperature antiferromagnetism of Mn2BO4 single crystal / N. V. Kazak [et al.] // J. Magn. Magn. Mater. - 2015. - Vol. 393. - P. 316-324, DOI 10.1016/j.jmmm.2015.05.081. - Cited References:33. - The authors wish to thank to Prof. M.V.Gorev and Prof J. Bartolome for fruitful discussions, Russian Foundation for Basic Research (Projects no13-02-00958, 13-02-00358, and 14-02-31051-mol-a), Council for Grants of the President of the Russian Federation (Project nos. NSh-2886.2014.2, and SP-938.2015.5). The work of one of coauthors (M.S.P.) was supported by the program of Foundation for Promotion of Small Enterprises in Science and Technology (Grant number 5468GU1/2014) ("UMNIK" program). . - ISSN 0304-8853. - ISSN 1873-4766
   Перевод заглавия: Одноосная анизотропия и низкотемпературный антиферромагнетизм монокристалла Mn2BO4

РУБ Materials Science, Multidisciplinary + Physics, Condensed Matter
Рубрики:
MAGNETIC-PROPERTIES
   WARWICKITE
   OXYBORATE
   PARAMETERS
   LUDWIGITE
Кл.слова (ненормированные):
Antiferromagnets -- Oxides -- Magnetic anisotropy -- Exchange interactions
Аннотация: The Mn2BO4 single crystals have been grown by the flux technique. A careful study of the crystal structure and magnetic properties have been carried out The antiferromagnetic transition at T-N=26 K has been traced through the dc magnetization and specific heat temperature dependences. Magnetic uniaxial anisotropy has been found with easy axis magnetization lying in the ab-plane. The obtained value of effective magnetic moment is assigned to the non-quenched orbital moment of Jahn-Teller Mn3+ ions. The discussion of magnetic properties is based on the superexchange interaction calculations. (C) 2015 Elsevier B.V. All rights reserved.

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Держатели документа:
RAS, LV Kirensky Inst Phys, SB, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660036, Russia.
Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia.
Int Lab High Magnet Fields & Low Temp, PL-53421 Wroclaw, Poland.
RAS, PN Lebedev Phys Inst, Moscow 119991, Russia.
Natl Acad Sci Ukraine, OO Galkin Donetsk Inst Phys & Engn, UA-83114 Donetsk, Ukraine.

Доп.точки доступа:
Kazak, N. V.; Казак, Наталья Валерьевна; Platunov, M. S.; Платунов, Михаил Сергеевич; Knyazev, Yu. V.; Ivanova, N. B.; Bayukov, O. A.; Баюков, Олег Артемьевич; Vasiliev, A. D.; Васильев, Александр Дмитриевич; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Nizhankovskii, V. I.; Gavrilkin, S. Yu.; Lamonova, K. V.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Russian Foundation for Basic Research [13-02-00958, 13-02-00358, 14-02-31051-mol-a]; Council for Grants of the President of the Russian Federation [NSh-2886.2014.2, SP-938.2015.5]; program of Foundation for Promotion of Small Enterprises in Science and Technology [5468GU1/2014]
}
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Transition of metastable pyrrhotites to a stable phase state / V. V. Onufrienok, A. V. Chzhan, G. V. Bondarenko, G. Y. Yurkin // Inorg. Mater. - 2020. - Vol. 56, Is. 9. - P. 898-902, DOI 10.1134/S0020168520090137. - Cited References: 23 . - ISSN 0020-1685. - ISSN 1608-3172

РУБ Materials Science, Multidisciplinary
Рубрики:
MAGNETIC-PROPERTIES
TEMPERATURE
CHEMISTRY
Кл.слова (ненормированные):
mineral -- pyrite -- troilite -- impurity centers -- magnetization
Аннотация: Equilibrium phase relations of synthetic minerals prepared by annealing metastable iron sulfides, followed by prolonged isothermal storage in the Earth atmosphere, have been studied by X-ray diffraction. The results demonstrate that prolonged storage of synthetic pyrrhotites annealed at different temperatures makes it possible to identify metastable and stable phases of Fe and S compounds.

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Публикация на русском языке Переход метастабильных пирротинов в стабильное фазовое состояние [Текст] / В. В. Онуфриенок, А. В. Чжан, Г. В. Бондаренко, Г. Ю. Юркин // Неорган. матер. - 2020. - Т. 56 № 9. - С. 948-952

Держатели документа:
Krasnoyarsk State Agr Univ, Krasnoyarsk 660049, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
Russian Acad Sci, Inst Chem & Chem Technol, Siberian Branch, Krasnoyarsk 660036, Russia.
Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Onufrienok, V. V.; Chzhan, A. V.; Bondarenko, G. V.; Yurkin, G. Yu.; Юркин, Глеб Юрьевич
}
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Thermomagnetic behaviour and compositional irreversibility on (Fe/Si)3 multilayer films / L. Badía-Romano [et al.] // J. Magn. Magn. Mater. - 2014. - Vol. 364. - P. 24-33, DOI 10.1016/j.jmmm.2014.04.029. - Cited References: 52. - The financial support of the Spanish MINECOMAT2011-23791, FIS2008-06249, the President of Russia Grant (NSh-1044.2012.2), RFFI Grant 13-02-01265, 14-0290404, Aragonese DGA-IMANA E34 (cofunded by Fondo Social Europeo) and that received from the European Union FEDER funds is acknowledged. L.B.R. acknowledges the Spanish MINECO FPU 2010 grant. Authors would like to acknowledge the use of Servicio General de Apoyo a la Investigación-SAI, Universidad de Zaragoza. . - ISSN 0304-8853. - ISSN 1873-4766

РУБ Materials Science, Multidisciplinary + Physics, Condensed Matter
Рубрики:
SPUTTERED FE/SI SUPERLATTICES
   INTERLAYER EXCHANGE
   GIANT MAGNETORESISTANCE
   MAGNETIC-PROPERTIES
   SILICIDE FORMATION
   EPITAXIAL-GROWTH
   ROOM-TEMPERATURE
   IRON DISILICIDE
   TRILAYER FILMS
   THIN-FILMS
Кл.слова (ненормированные):
Fe-Si multilayer -- Chemical transformation -- Fe silicide -- Interlayer exchange coupling -- Magnetic domain -- in situ annealing
Аннотация: This work presents the correlation between the morphology and magnetic properties of (Fe/Si)3 multilayers with different Fe layer thicknesses and fixed Si spacer thickness in a broad temperature range (View the MathML source5
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Держатели документа:
Univ Zaragoza, CSIC, Inst Ciencia Mat Aragon, E-50009 Zaragoza, Spain
Univ Zaragoza, Dept Fis Mat Condensada, E-50009 Zaragoza, Spain
Univ Zaragoza, Dept Ciencia Mat & Ingn Met, E-50018 Zaragoza, Spain
Univ Zaragoza, Inst Nanociencia Aragon, Lab Microscopias Avanzadas, E-50018 Zaragoza, Spain
Fdn ARAID, E-50004 Zaragoza, Spain
Univ Porto, Fac Ciencias, Dept Fis Astron, IN IFIMUP, P-4169007 Oporto, Portugal
Univ Oviedo, Dept Fis, E-33007 Oviedo, Spain
Univ Oviedo Principado Asturias, CSIC, CINN, E-33007 Oviedo, Spain
Forschungszentrum Julich, Elect Properties, Peter Grunberg Inst PGI 6, D-52425 Julich, Germany
Russian Acad Sci, Siberian Div, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Siberian Aerospace Univ, Krasnoyarsk 660014, Russia
Siberian Fed Univ, Krasnoyarsk 660036, Russia

Доп.точки доступа:
Badía-Romano, L.; Rubín, J.; Magén, C.; Bartolomé, F.; Sesé, J.; Ibarra, M.R.; Bartolomé, J.; Hierro-Rodriguez, A.; Martín, J.I.; Alameda, J.M.; Bürgler, D.E.; Varnakov, S. N.; Варнаков, Сергей Николаевич; Komogortsev, S. V.; Комогорцев, Сергей Викторович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич
}
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Thermoelectric properties of the SmCoO3 and NdCoO3 cobalt oxides / V. A. Dudnikov, A. S. Fedorov, Y. S. Orlov [et al.] // Ceram. Int. - 2020. - Vol. 46, Is. 11. - P. 17987-17991, DOI 10.1016/j.ceramint.2020.04.113. - Cited References: 41. - This study was supported by the Russian Science Foundation, project no. 16-13-00060. . - ISSN 0272-8842. - ISSN 1873-3956

РУБ Materials Science, Ceramics
Рубрики:
MAGNETIC-PROPERTIES
   SPIN
   CONDUCTIVITY
   TRANSITIONS
   LACOO3
   SITE
Кл.слова (ненормированные):
Perovskite -- Thermoelectric oxide materials
Аннотация: The thermoelectric properties of the NdCoO3 and SmCoO3 rare-earth cobalt oxides with a perovskite structure have been investigated in a wide temperature range. It is shown that, in the low-temperature region, the thermal conductivity of the compounds has a sharp maximum and the electrical conductivity of the samples increases with temperature, whereas the Seebeck coefficient behaves nonmonotonically with increasing temperature. The SmCoO3 oxide is characterized by the positive thermopower over the entire investigated range with a sharp growth in the low-temperature region, attaining the maximum value (S ≈ 1000 μV/K) near room temperature, and a further decrease. It has been established that, in the NdCoO3 oxide, the Seebeck coefficient changes its sign, which was rarely observed in the La-based compounds and is atypical of the undoped rare-earth cobalt oxides. The thermopower maximum obtained at a temperature of 450 K is 400 μV/K. The regions of the fastest growth of the thermoelectric power factor correspond to the anomalies caused by the spin transition of Со3+ ions and the dielectric–metal transition.

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Держатели документа:
Russian Acad Sci, Krasnoyarsk Sci Ctr, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia.
Russian Acad Sci, Krasnoyarsk Sci Ctr, Inst Chem & Chem Technol, Siberian Branch, Krasnoyarsk 660036, Russia.
Russian Acad Sci, Lebedev Phys Inst, Moscow 119991, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
Ioffe Inst, St Petersburg 194021, Russia.

Доп.точки доступа:
Dudnikov, V. A.; Дудников, Вячеслав Анатольевич; Fedorov, A. S.; Федоров, Александр Семенович; Orlov, Yu. S.; Орлов, Юрий Сергеевич; Solovyov, L. A.; Vereshchagin, S. N.; Gavrilkin, S. Yu; Tsvetkov, A. Yu; Gorev, M. V.; Горев, Михаил Васильевич; Novikov, S., V; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Russian Science FoundationRussian Science Foundation (RSF) [16-13-00060]
}
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Theoretical study of γ′-Fe4N and ɛ-FexN iron nitrides at pressures up to 500 GPa / Z. I. Popov [et al.] // JETP Letters. - 2015. - Vol. 101, Is. 6. - P. 371-375, DOI 10.1134/S0021364015060090. - Cited References:27. - This work was supported by the Russian Science Foundation (project no. 14-17-00601), by the Council of the President of the Russian Federation for Support of Young Scientists and Leading Scientific Schools (project Nos. MD-500.2013.5 and NSh-2886.2014.2), by the Ministry of Education and Science of the Russian Federation (project no. 14.B25.31.0032), and by the Presidium of the Russian Academy of Sciences (project no. 2.16) . - ISSN 0021. - ISSN 1090-6487. -

РУБ Physics, Multidisciplinary
Рубрики:
Initio molecular-dynamics
   Augmented-wave method
   Magnetic-properties
   Transition
   ε-Fe3N1+x
   Core
   Fe4N
Аннотация: The parameters of equations of state of stoichiometric and nonstoichiometric phases of the γ′-Fe4N, ɛ-Fe3N0.75, ɛ-Fe3N, ɛ-Fe3N1.25, and ɛ-Fe3N1.5 iron nitrides in a pressure range up to 500 GPa have been determined using ab initio calculations. The points of the sharp drop and disappearance of the magnetic moment on iron atoms have been found. It has been shown that certain changes in the magnetic moment are accompanied by a change in the volume of a unit cell of the nitrides. The calculated parameters of equations of state demonstrate that the compressibility of both magnetic and nonmagnetic iron nitrides decreases monotonically with an increase in the content of nitrogen.

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Публикация на русском языке Теоретическое исследование нитридов железа γ'-Fe4N и ε-FexN при давлениях до 500 ГПа [Текст] / З. И. Попов [и др.] // Письма в Журн. эксперим. и теор. физ. : Наука, 2015. - Т. 101 Вып. 5-6. - С. 405-409

Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
Russian Acad Sci, Sobolev Inst Geol & Mineral, Siberian Branch, Novosibirsk 630090, Russia
Novosibirsk State Univ, Novosibirsk 630090, Russia

Доп.точки доступа:
Popov, Z. I.; Попов, Захар Иванович; Litasov, K. D.; Gavryushkin, P. N.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Fedorov, A. S.; Федоров, Александр Семенович
}
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Tailoring the microwave properties of thin permalloy films using a periodically grooved substrate / A. V. Izotov, B. A. Belyaev, N. M. Boev [et al.] // Physica B. - 2022. - Vol. 629. - Ст. 413654, DOI 10.1016/j.physb.2021.413654. - Cited References: 50. - This work was supported by the Ministry of Science and Higher Education of the Russian Federation, agreement number 075-11-2019054 dated November 22, 2019 . - ISSN 0921-4526. - ISSN 1873-2135

РУБ Physics, Condensed Matter
Рубрики:
FERROMAGNETIC-RESONANCE
   MAGNETIC-PROPERTIES
   ANISOTROPY
   FREQUENCY
Кл.слова (ненормированные):
Patterned film -- Topography-induced anisotropy -- Netzelmann approach -- Ferromagnetic resonance -- Damping parameter
Аннотация: Thin magnetic films with periodic surface topography are of special interest for microwave applications as their static and dynamic magnetic characteristics can be readily adjusted. In this paper, we explore the capabilities of a simple method for producing large-area periodically patterned films by creating regularly spaced grooves on a substrate using a diamond cutter. For 110-nm-thick films, it was found that the substrate-topography-induced magnetic anisotropy was inversely proportional to the pattern period, which in experimental samples varied from 5 to 20 mu m. Based on the Netzelmann theory, analytical expressions for demagnetization tensor components were obtained, which accord well with the experimental data. The measurements of the natural ferromagnetic resonance spectra demonstrated that the increase of the topography-induced magnetic anisotropy with the decrease of the pattern period led to the increase of the resonance frequency from 0.65 to 1.86 GHz, and to a decrease of the linewidth and effective damping parameter.

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Держатели документа:
Siberian Fed Univ, 79 Svobodny Pr, Krasnoyarsk 660041, Russia.
Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, 50-38 Akademgorodok, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Izotov, A. V.; Изотов, Андрей Викторович; Belyaev, B. A.; Беляев, Борис Афанасьевич; Boev, N. M.; Боев, Никита Михайлович; Burmitskikh, A. V.; Бурмитских, Антон Владимирович; Leksikov, An. A.; Лексиков, Андрей Александрович; Skomorokhov, G. V.; Скоморохов, Георгий Витальевич; Solovev, P. N.; Соловьев, Платон Николаевич; Ministry of Science and Higher Education of the Russian Federation [075-11-2019054]
}
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Synthesis, structure, and properties of EuLnCuSe3 (Ln = Nd, Sm, Gd, Er) / O. V. Andreev, V. V. Atuchin, A. S. Aleksandrovsky [et al.] // Crystals. - 2022. - Vol. 12, Is. 1. - Ст. 17, DOI 10.3390/cryst12010017. - Cited References: 60. - The study was funded by the Ministry of Science and Higher Education of the Russian Ferderation (Projects AAAA-A21-121011390011-4 and AAAA-A19-119031890025-9), as well as the Government of the Tyumen Region (grant to non-profit organizations No. 2. 89-don, dated 7 December 2020) . - ISSN 2073-4352

РУБ Crystallography + Materials Science, Multidisciplinary
Рубрики:
RARE-EARTH
   CRYSTAL-STRUCTURE
   MAGNETIC-PROPERTIES
   CHALCOGENIDES
Кл.слова (ненормированные):
rare earth elements -- complex sulfides -- chalcogenides -- crystal structure -- magnetic properties
Аннотация: EuLnCuSe3 (Ln = Nd, Sm, Gd, Er), due to their complex composition, should be considered new materials with the ability to purposefully change the properties. Samples of the EuLnCuSe3 were prepared using Cu, rare earth metal, Se (99.99%) by the ampoule method. The samples were obtained by the crystallization from a melt and annealed at temperatures 1073 and 1273 K. The EuErCuSe3 crystal structure was established using the single-crystal particle. EuErCuSe3 crystallizes in the orthorhombic system, space group Cmcm, KCuZrS3 structure type, with cell parameters a = 4.0555 (3), b = 13.3570 (9), and c = 10.4602 (7) Å, V = 566.62 (6) Å3. In structure EuErCuSe3, erbium ions are coordinated by selenium ions in the octahedral polyhedron, copper ions are in the tetrahedral coordination, europium ions are between copper and erbium polyhedra layers and are coordinated by selenium ions as two-cap trigonal prisms. The optical band gap is 1.79 eV. At 4.7 K, a transition from the ferrimagnetic state to the paramagnetic state was detected in EuErCuSe3. At 85 and 293 K, the compound is in a paramagnetic state. According to XRPD data, EuLnCuSe3 (Ln = Nd, Sm, Gd) compounds have a Pnma orthorhombic space group of the Eu2CuS3 structure type. For EuSmCuSe3, a = 10.75704 (15) Å, b = 4.11120 (5) Å, c = 13.37778 (22) Å. In the series of EuLnCuSe3 compounds, the optical band gap increases 1.58 eV (Nd), 1.58 eV (Sm), 1.72 eV (Gd), 1.79 eV (Er), the microhardness of the 205 (Nd), 210 (Sm), 225 (Gd) 235 ± 4 HV (Er) phases increases, and the thermal stability of the phases increases significantly. According to the measurement data of differential scanning calorimetry, the EuNdCuSe3 decomposes, according to the solid-phase reaction T = 1296 K, ΔH = 8.2 ± 0.8 kJ/mol. EuSmCuSe3 melts incongruently T = 1449 K, ΔH = 18.8 ± 1.9 kJ/mol. For the EuGdCuSe3, two (Tα↔β = 1494 K, ΔHα↔β = 14.8 kJ/mol, Tβ↔γ = 1530 K, ΔHβ↔γ = 4.8 kJ/mol) and for EuErCuSe3 three polymorphic transitions (Tα↔β = 1561 K, ΔHα↔β = 30.3 kJ/mol, Tβ↔γ = 1579 K, ΔHβ↔γ = 4.4 kJ/mol, and Tγ↔δ = 1600 K, ΔHγ↔δ = 10.1 kJ/mol). The compounds melt incongruently at the temperature of 1588 K, ΔHmelt = 17.9 ± 1.8 kJ/mol and 1664 K, ΔHmelt = 25.6 ± 2.5 kJ/mol, respectively. Incongruent melting of the phases proceeds with the formation of a solid solution of EuSe and a liquid phase.

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Держатели документа:
Univ Tyumen, Inst Chem, Tyumen 625003, Russia.
RAS, Inst Semicond Phys, Lab Opt Mat & Struct, SB, Novosibirsk 630090, Russia.
Kemerovo State Univ, Res & Dev Dept, Kemerovo 650000, Russia.
Novosibirsk State Tech Univ, Dept Ind Machinery Design, Novosibirsk 630073, Russia.
RAS, KSC, Fed Res Ctr, Kirensky Inst Phys,SB, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Dept Photon & Laser Technol, Krasnoyarsk 660036, Russia.
Ind Univ Tyumen, Dept Gen & Special Chem, Tyumen 625000, Russia.
RAS, Boreskov Inst Catalysis, SB, Novosibirsk 630090, Russia.
Novosibirsk State Univ, Lab Mol Design & Ecol Safe Technol, Novosibirsk 630090, Russia.
RAS, Inst Solid State Chem, UB, Ekaterinburg 620990, Russia.

Доп.точки доступа:
Andreev, O. V.; Atuchin, V. V.; Aleksandrovsky, A. S.; Александровский, Александр Сергеевич; Denisenko, Y. G.; Zakharov, B. A.; Tyutyunnik, A. P.; Habibullayev, N. N.; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Ulybin, D. A.; Shpindyuk, D. D.; Ministry of Science and Higher Education of the Russian Ferderation [AAAA-A21-121011390011-4, AAAA-A19-119031890025-9]; Government of the Tyumen Region [2. 89-don]
}
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    Synthesis and crystal structure of a new hexagonal perovskite 7H-Ba7Li1.75Mn3.5O15.75 with Mn4+/Mn5+ charge distribution / N. V. Tarakina [et al.] // Dalton Trans. - 2015. - Vol. 44, Is. 42. - P. 18527-18535, DOI 10.1039/c5dt01528f. - Cited References: 40. - The authors regret a spelling mistake in the surname of one of authors. The surname given as ‘Vasilev’ should be ‘Vasiliev’. - N.V.T. acknowledges funding by the Bavarian Ministry of Sciences, Research and the Arts. X-ray powder diffraction studies were carried out at the Center for collective use "X-ray structure analysis" at the Institute of Solid State Chemistry, Ural Branch of RAS (Ekaterinburg, Russia) . - ISSN 1477-9226
   Перевод заглавия: Синтез и кристаллическая структура нового гексагонального перовскита 7H-Ba7Li1.75Mn3.5O15.75 с зарядовым распределением Mn4+/Mn5+

РУБ Chemistry, Inorganic & Nuclear
Рубрики:
Magnetic-properties
Chemistry
Phases
Аннотация: Ba7Li1.75Mn3.5O15.75 is a new hexagonal perovskite whose crystal structure has elements typical for the layered hexagonal perovskites and quasi-one-dimensional oxides, hence representing a new polytype. It has been synthesized via a solid-state microwave route. The crystal structure was solved using a combination of X-ray and neutron diffraction data, which show that Ba7Li1.75Mn3.5O15.75 crystallizes in a hexagonal unit cell with parameters a = 5.66274(2) A and c = 16.7467(1) A (V = 465.063(4) A3), with one formula unit, and can be described as columns of face-shared octahedra occupied by Mn4+ and Li+ cations and vacancies along the c axis separated in the ab plane by barium atoms. Every sixth layer, the coordination of Mn5+ and Li+ changes to tetrahedral. Additional local ordering of manganese and lithium atoms among cationic sites leading to the formation of a rhombohedral supercell has been observed by scanning transmission electron microscopy.

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The NanoVision Centre, School of Engineering and Materials Science, Queen Mary University of London Mile End, London, United Kingdom
Experimentelle Physik III, Physikalisches Institut and Wilhelm Conrad, Rontgen-Research Centre for Complex Material Systems, Universitat Wurzburg Am Hubland, Wurzburg, Germany
Institute of Solid State Chemistry, Ural Branch of the Russian Academy of Sciences, 91 Pervomayskaya, Ekaterinburg, Russian Federation
L.V. Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences, 50 Akademgorodok, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Tarakina, N. V.; Tyutyunnik, A. P.; Bazuev, G. V.; Vasiliev, A. D.; Васильев, Александр Дмитриевич; Gould, C.; Nikolaenko, I. V.; Berger, I. F.
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Superparamagnetic and ferrimagnetic nanoparticles in glass matrix / I. S. Edelman [et al.] // Physica B. - 2001. - Vol. 301, Is. 3-4. - P. 203-211, DOI 10.1016/S0921-4526(01)00274-5. - Cited References: 9 . - ISSN 0921-4526

РУБ Physics, Condensed Matter
Рубрики:
MAGNETIC-PROPERTIES
PARTICLES
FILMS
Кл.слова (ненормированные):
magnetic nanoparticles -- Faraday rotation -- Faraday rotation -- Magnetic nanoparticles -- Crystal structure -- Faraday effect -- Ferrimagnetic materials -- Glass -- Particle size analysis -- Superparamagnetism -- X ray diffraction analysis -- Amorphous glass matrices -- Faraday rotations -- Nanostructured materials
Аннотация: Faraday rotation (FR) spectral, field, and temperature dependencies in oxide glasses with small additions of paramagnetic elements are investigated. Formation of ferrite nanoparticles in amorphous glass matrices is revealed by X-ray diffraction. Particles have crystal structure similar to spinel structure, their dimensions are about 10-24 nm. The FR field dependencies are typical for ferrimagnetic or superparamagnetic substances depending on particle size. Strong FR increase at the samples cooling (more than twice for some samples) in the temperature interval 105-273 K is observed. (C) 2001 Elsevier Science B.V. All rights reserved.

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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
SI Vavilov State Opt Inst, St Petersburg 193117, Russia
ИФ СО РАН
L.V. Kirensky Institute of Physics, Russian Academy of Sciences-SB, Krasnoyarsk 660036, Russian Federation
S.I. Vavilov Optical State Institute, St. Peterburg 193117, Russian Federation

Доп.точки доступа:
Edelman, I. S.; Эдельман, Ирина Самсоновна; Ivantsov, R.; Vasiliev, A.; Stepanov, S.; Kornilova, E.; Zarubina, T.
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10.

Study of structural and ferromagnetic resonance properties of spinel lithium ferrite (LiFe5O8) single crystals / N. Pachauri [et al.] // J. Appl. Phys. - 2015. - Vol. 117, Is. 23. - Ст. 233907, DOI 10.1063/1.4922778. - Cited References:32. - This work has been supported by NSF Grant No. ECCS-1102263. Tim Mewes and Behrouz Khodadadi would like to acknowledge support by the NSF-CAREER Award No. 0952929. R. Datta and B. Loukya sincerely acknowledge ICMS for providing advanced microscopy facility and funding. We thank Sahar Keshavarz, Archana Panikar, Stefan Kingler, and Jamileh Beik Mohammadi for help with the experimental work. . - ISSN 0021. - ISSN 1089-7550. -

РУБ Physics, Applied
Рубрики:
EFFECTIVE LINEWIDTH
   MAGNETIC-PROPERTIES
   FIELD
   TEMPERATURE
   DEPENDENCE
Аннотация: The effect of B-site cation ordering on the room temperature structural and ferromagnetic resonance (FMR) properties of single crystal spinel lithium ferrite (LiFe5O8, LFO) have been investigated. A detailed microstructural analysis is done through X-ray diffraction, polarized Raman spectroscopy, and transmission electron microscopy (TEM) to examine the effect of post-annealing on the B-site cation ordering. The X-ray diffraction pattern of the as-grown crystal indicates a disordered state of the crystal. However, the annealed sample shows additional superlattice reflections corresponding to the ordered phase. This ordering is further confirmed by Raman spectra and TEM images, which reveal ordering of Li and Fe ions at the octahedral sites contrasting with the relatively high degree of octahedral site disorder in the as-grown crystal. To study the effect of B-site ordering on the magnetic properties and FMR linewidth, vibrating sample magnetometry and broadband FMR measurements have been performed for both the ordered and disordered phases of lithium ferrite. The value of saturation magnetization for both phases is ∼290 emu/cm3. A single mode FMR profile is observed for both phases with little distortion. The linewidth characteristics of the ordered and disordered phases of lithium ferrite phases are compared, and it is observed that the linewidth is independent of the cation ordering. Both the phases exhibit a low linewidth (∼26 Oe at 30 GHz) and the effective damping parameter for the as-grown and annealed samples is determined to be 0.0021 ± 0.0001.
Влияние катионного упорядочения в Б-позициях при комнатной температуре на структурные свойства и ферромагнитный резонанс (ФМР) монокристалла литий железной шпинели (LiFe5O8, LFO) были исследованы. Подробный анализ микроструктуры делается с использованием рентгеновской дифракции, спектроскопии комбинационного рассеяния поляризованного света и просвечивающей электронной микроскопии (ПЭМ), чтобы изучить влияние после отжига на катионное упорядочение в B-позиции. Рентгеновская дифракционная картина, так выращенных кристаллов указывает на беспорядочное состояние кристалла. Тем не менее, пример показывает дополнительные индексы, соответствующие сверхрешетчатой упорядоченной фазы, при отжиге. Этот порядок подтверждается также спектрами комбинационного рассеяния и ТЕМ изображений, которые показывают порядок ионов Li и Fe в октаэдрических контрастными с относительно высокой степенью восьмигранной расстройства позиций в выращенных кристаллах. Для изучения влияния упорядочения В-позиций на магнитные свойства и ширины линии ФМР, вибрационные образцы магнитометрии и широкополосных ФМР измерений были выполнены как для упорядоченных и неупорядоченных фаз литиевого феррита. Значение намагниченности насыщения для обоих фаз ~290 emu / см3. Одиночный профиль в режиме ФМР наблюдается для обеих фаз с небольшим искажением. Ширина линии характеристики упорядоченной и неупорядоченной фаз литиевых ферритов сравниваются, и следует отметить, что ширина линии не зависит от катионного упорядочения. Оба фазы проявляют малую ширину линии (Э около 26 на 30 ГГц) и эффективный параметр демпфирования, как, для только выращенных, так и для отожженных образцов, определяется как 0,0021 ± 0,0001.

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Держатели документа:
Univ Alabama, Dept Phys & Astron, MINT Ctr, Tuscaloosa, AL 35487 USA.
Univ Alabama, Dept Chem, MINT Ctr, Tuscaloosa, AL 35487 USA.
Jawaharlal Nehru Ctr Adv Sci Res, Int Ctr Mat Sci, Bangalore 560064, Karnataka, India.
Univ Houston, Texas Ctr Superconduct, Houston, TX 77204 USA.
Univ Houston, Dept Phys, Houston, TX 77204 USA.
SB RAS, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Pachauri, Neha; Khodadadi, B.; Althammer, M.; Singh, A.V.; Loukya, B.; Datta, R.; Iliev, M.; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Gudim, I. A.; Гудим, Ирина Анатольевна; Mewes, T.; Gupta, A.; NSF [ECCS-1102263]; NSF-CAREER [0952929]; ICMS
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