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Вид документа : Однотомное издание
Шифр издания : В37 рукописный текст
Автор(ы) : Платунов, Михаил Сергеевич
Заглавие : Комплексное исследование кристаллической и магнитной структуры кобальтсодержащих оксиборатов с использованием рентгеновской спектроскопии : автореферат дис. на соиск. уч. степени канд. физ.-мат. наук : 01.04.07
Выходные данные : Красноярск: ИФ СО РАН, 2013
Колич.характеристики :27 с
Коллективы : Российская академия наук, Сибирское отделение РАН, Институт физики им. Л.В. Киренского Сибирского отделения РАН, Институт ядерной физики им. Г.И. Будкера Сибирского отделения РАН
Примечания : Библиогр.
ГРНТИ : 29.19.04 + 29.31.26
Предметные рубрики: Кристаллы-- Бораты-- Методы исследования
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Вид документа : Однотомное издание
Шифр издания : В37/П 37 рукописный текст
Автор(ы) : Платунов, Михаил Сергеевич
Заглавие : Комплексное исследование кристаллической и магнитной структуры кобальтсодержащих оксиборатов с использованием рентгеновской спектроскопии : дис. на соиск. уч. степени канд. физ.-мат. наук : 01.04.07
Выходные данные : Красноярск, 2013
Колич.характеристики :131 с
Коллективы : Российская академия наук, Сибирское отделение РАН, Институт физики им. Л.В. Киренского Сибирского отделения РАН
Примечания : Библиогр.: 109 назв.
ГРНТИ : 29.19.04 + 29.31.26
ББК : В371.21я031 + В374я031
Экземпляры :ДС(1)
Свободны : ДС(1)
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Moshkina E. M., Platunov M. S., Seryotkin Y. V., Bovina A. F., Eremin E. V., Sofronova S. N., Bezmaternykh L. N.
Заглавие : Transformation of structure and magnetic properties of Cu2MnBO5 under partial Mn3+ → Fe3+ substitution
Место публикации : J. Magn. Magn. Mater. - 2018. - Vol. 464. - P.1-10. - ISSN 03048853 (ISSN), DOI 10.1016/j.jmmm.2018.05.021
Примечания : Cited References: 25. - This study was supported by Russian Foundation for Basic Research ( RFBR ) and Government of Krasnoyarsk Territory according to the research project No. 16-42-243028. X-ray diffraction experiment was carried out at the Centre on Molecular Design and Ecologically Safe Technologies at the Novosibirsk State University. The work of one of the coauthors (M.S.P.) was supported by the Russian Foundation for Basic Research (project no. 16-32-60049) and by the program of Foundation for promoting the development of small enterprises in scientific and technical sphere (“UMNIK” program).
Ключевые слова (''Своб.индексиров.''): ludwigites--crystal growth--ferrimagnets--quasi-low-dimensional structure--magnetic phase transitions
Аннотация: Single crystals of Fe-substituted Cu2Mn1-xFexBO5 ludwigites have been synthesized using flux technique (x = 0.2, 0.4, 0.5 – in the initial flux system). Structural properties of the synthesized compounds were studied by the single crystal and powder X-ray diffraction analysis. Obtained results were analyzed in the relationship with parent compound Cu2MnBO5. It was revealed that the type of monoclinic distortions of Fe-substituted ludwigites is different from the structure of Cu2MnBO5. The real cation composition and local structure of Cu2Mn1-xFexBO5 ludwigites were studied using XANES and EXAFS techniques, respectively. Analysis of field and thermal dependencies of magnetization showed a high dependence of the magnetic properties of these ludwigites on x with changing the type of magnetic ordering.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Platunov M. S., Kazak N. V., Dudnikov V. A., Wilhelm F., Hen A., Diadkin V., Dovgaliuk I., Bosak A., Temerov V. L., Gudim I. A., Knyazev Yu. V., Gavrilkin S. Yu., Rogalev A., Ovchinnikov S. G.
Заглавие : Probing magnetic sublattices in multiferroic Ho0.5Nd0.5Fe3(BO3)4 single crystal using X-ray magnetic circular dichroism
Место публикации : ArXiv. - 2018. - Ст.1804.07057
Примечания : Cited References: 28. - The study was supported in part by the grants of the Russian Foundation for Basic Research (project nos. 16-32-60049, 17-02-00826) and the Foundation for Assistance to Small Innovative Enterprises (FASIE, UMNIK program). The authors thank the BM01A/ID28/ID12 beamlines staffs for help during the experiment and also gratefully acknowledge the beamtime provision (proposal HC-1804) by the ESRF.
Предметные рубрики: Antiferromagnetics
Magnetic anisotropy
Magnetoelectric effects, multiferroics
Аннотация: Using element-specific X-ray magnetic circular dichroism (XMCD) technique we have studied different magnetic sublattices in a multiferroic Ho0.5Nd0.5Fe3(BO3)4 single crystal. The XMCD measurements at the L2,3-edges of Ho and Nd, and at the Fe \emph{K}-edge have been performed at T=2K under a magnetic field up to 17 T applied along the trigonal c-axis as well as in the basal ab-plane. All three magnetic sublattices are shown to undergo a spin-reorientation transition under magnetic field applied along the c-axis. On the contrary, when magnetic field is applied in the ab-plane only the holmium atoms exhibit a magnetization jump. Thus, the element-specific magnetization curves revealed the Ho sublattice to be much stronger coupled to the Fe one than the Nd sublattice. The results demonstrate that the Ho3+ subsystem plays even more dominant role in magnetic behavior of Ho0.5Nd0.5Fe3(BO3)4 crystal than in pure HoFe3(BO3)4 crystal.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Moshkina E. M., Platunov M. S., Seryotkin Yu. V., Bovina A. F., Eremin E. V., Sofronova S. N., Bezmaternykh L. N.
Заглавие : Evolution of structure and magnetic properties of Cu2MnBO5 under partial Mn3+→Fe3+ substitution [Electronic resource]
Место публикации : ArXiv. - 2017. - Ст.1712.00799
Вид и объем ресурса: Electronic text data
Примечания : Cited References: 25. - This study was supported by Russian Foundation for Basic Research (RFBR) and Government of Krasnoyarsk Territory according to the research project No. 16-42-243028. X-ray diffraction experiment was carried out at the Centre on Molecular Design and Ecologically Safe Technologies at the Novosibirsk State University. The work of one of the coauthors (M.S.P.) was supported by the Russian Foundation forBasic Research (project no. 16-32-60049) and by the program of Foundation for promoting the development of small enterprises in scientificand technical sphere (“UMNIK” program).
Аннотация: Single crystals of Fe-substituted Cu2Mn1-xFexBO5 ludwigites have been synthesized using flux technique (x=0.2, 0.4, 0.5 - in the initial flux system). Structural properties of the synthesized compounds were studied by the single crystal and powder X-ray diffraction analysis. Obtained results were analyzed in the relationship with parent compound Cu2MnBO5. It was revealed that the type of monoclinic distortions of Fe-substituted ludwigites is different from the structure of Cu2MnBO5. The real cation composition and local structure of Cu2Mn1-xFexBO5 ludwigites were studied using XANES and EXAFS techniques, respectively. Analysis of field and thermal dependencies of magnetization showed a strong dependence of the magnetic properties of these ludwigites on x with changing the type of magnetic ordering.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Orlov Yu. S., Dudnikov V. A., Platunov M. S., Gorev M. V., Velikanov D. A., Kazak N. V., Gavrilkin S. Yu., Solov’ev L. A., Veligzhanin A. A., Vereshchagin S. N., Ovchinnikov S. G.
Заглавие : Low-temperature Schottky anomalies and the magnetic state of the p electrons of oxygen in substituted Gd0.4Sr0.6CoO3 – δ cobaltites
Место публикации : J. Exp. Theor. Phys. - 2018. - Vol. 126, Is. 2. - P.217-223. - ISSN 10637761 (ISSN), DOI 10.1134/S1063776118020036
Примечания : Cited References: 29. - This work was supported by the Russian Foundation for Basic Research, the Government of the Krasnoyarsk Territory, and Krasnoyarsk Territory Foundation for the Support of Scientific and Research Activity (project nos. 16-42-240413, 16-43-240505); the Council on Grants at the President of the Russian Federation (project nos. SP-1844.2016.1, SP-938.2015.5, NSh-7559.2016.2); and the Russian Foundation for Basic Research (project nos. 17-02-00826, 16-02-00507, 16-32-60049).
Ключевые слова (''Своб.индексиров.''): rare earths--single crystals--specific heat--temperature distribution--x ray absorption
Аннотация: The XANES spectra (X-ray absorption near-edge spectra) at the K edge of Co and the L3 edge of Gd in polycrystalline Gd0.4Sr0.6CoO3 – δ rare-earth oxides with an ordered and disordered distribution of Gd3+ and Sr2+ cations over the A sites in the crystal lattice are measured. The results of XANES measurements do not reveal a noticeable shift in the absorption edge with increasing Sr concentration as compared to the GdCoO3 parent composition. The measured temperature dependences of the heat capacity of polycrystalline ordered and disordered samples and a single-crystal ordered Gd0.4Sr0.6CoO2.85 sample exhibit two Schottky anomalies. These anomalies are thought to be related to the high-spin state of the Co3+ ions in the pyramidal environment caused by oxygen deficiency and to the magnetic state of oxygen p electrons induced by the doping-assisted generation of a hole in the 2p state. The absence of a noticeable shift in the absorption edge and the presence of two Schottky anomalies support the fact that the charge state of cobalt remains unchanged in the compounds under study.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Орлов, Юрий Сергеевич, Дудников, Вячеслав Анатольевич, Платунов, Михаил Сергеевич, Горев, Михаил Васильевич, Великанов, Дмитрий Анатольевич, Казак, Наталья Валерьевна, Гаврилкин С. Ю., Соловьев, Леонид Александрович, Велигжанин А.А., Верещагин С.Н., Овчинников, Сергей Геннадьевич
Заглавие : Низкотемпературные аномалии Шоттки и магнитное состояние Р-электронов кислорода в замещенных кобальтитах GDO
Место публикации : Журн. эксперим. и теор. физ. - 2018. - Т. 153, Вып. 2. - С. 259-267. - ISSN 0044-4510, DOI 10.7868/S0044451018020086
Примечания : Библиогр.: 29. - Работа выполнена при финансовой поддержке РФФИ, Правительства Красноярского края, Красноярского краевого фонда поддержки научной и научно-технической деятельности в рамках научных проектов №№16-42-240413, 16-43-240505, Совета по грантам Президента РФ (СП-1844.2016.1, СП-938.2015.5, НШ-7559.2016.2), РФФИ (гранты №№17-02-00826, 16-02-00507, 16-32-60049).
Аннотация: Приведены результаты измерений спектров рентгеновского поглощения (XANES) на K-крае Co и L3-крае Gd в поликристаллических редкоземельных оксидах Gd0.4Sr0.6CoO3-δ с упорядоченным и разупорядоченным распределениями катионов Gd3+ и Sr2+ по A-позициям кристаллической решетки. Измерения спектров XANES не обнаружили заметного смещения края поглощения с ростом концентрации Sr по сравнению с родительским составом GdCoO3. Измерение температурной зависимости теплоемкости поликристаллических упорядоченных и разупорядоченных образцов, так же как и монокристаллического упорядоченного Gd0.4Sr0.6CoO2.85, показало наличие двух аномалий Шоттки. Наблюдаемые аномалии связываются с высокоспиновым состоянием ионов кобальта Co3+ в пирамидальном окружении, обусловленном дефицитом по кислороду, и магнитным состоянием p-электронов кислорода, обусловленным рождением дырки в 2p-состоянии в результате легирования. Отсутствие заметного смещения края поглощения и существование двух аномалий Шоттки служат подтверждениями неизменности зарядового состояния кобальта в исследуемых соединениях.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Samardaki A. S., Kolesnikovi A., Ognev A., Platunov M. S., Rogalev A.
Заглавие : XMCD study of Ru/Co/W/Ru films with strong Dzyaloshinskii-Moriya interaction
Коллективы : IEEE International Magnetics Conference
Место публикации : IEEE International Magnetics Conference (INTERMAG). - 2018. - Ст.UNSP 1800GW01. - ISBN 978-1-5386-6425-4, DOI 10.1109/INTMAG.2018.8508080
Примечания : Cited References: 5
Аннотация: An enhancement of the spin-orbit effects arising on an interface between a ferromagnet (FM) and a heavy metal (HM) is possible through the strong breaking of the structural inversion symmetry in the layered films. We have found that the introduction of an ultrathin W interlayer between Co and Ru in Ru/Co/Ru films enables to preserve perpendicular magnetic anisotropy (PMA) and simultaneously induce a large interfacial Dzyaloshinskii-Moriya interaction (iDMI). We find that the Ru/Co/W/Ru films have PMA up to 0.35 nm of the nominal thickness of W(tW). The study of the spin-wave propagation in the Damon-Eshbach geometry by Brillouin light scattering (BLS) spectroscopy reveals the drastic increase of the iDMI value with the rising tW. The maximum iDMI of -3.1 erg/cm 2 is observed for tW=0.24 nm, which is 10 times larger than the latter for the quasi-symmetrical Ru/Co/Ru films [1]. Our polycrystalline Ru/Co/W/Ru films were prepared by magnetron sputtering on the SiO 2 substrates at room temperature. The base pressure in the chamber was 10−8 Torr. The working pressure of Ar+ was 10−4 Torr. In order to precise control the thickness of layers, we used low sputtering rates: V(Ru)=0.011 nm/s, V(Co)=0.018 nm/s, V(W)=0.02 nm/s. The Co thickness (tCo) was varied from 0.7 to 1.5 nm. The thickness of the buffer and capping Ru layers (tRu) was 10 and 2 nm, correspondingly. The W thickness (tW) was taken in the range from 0 to 0.4 nm. Polarization dependent X-ray spectroscopy measurements at the Co K− (7709 eV), WL3− (10207 eV) and WL2− (11544 eV) edges on the Ru(10nm)/Co(1nm)/W(x)/Ru(2nm) structures were performed at the ESRF ID12 beamline. Four different samples have been measured with x=0, 0.21, 0.25 and 0.29, where x is the thickness of the layer in nm. The APPLE-II undulator and a Si(111) double crystal monochromator were used to collect the spectra.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kazak N. V., Platunov M. S., Knyazev Yu. V., Moshkina E. M., Solovyov L. A., Vereshchagin S. N., Mikhlin, Yu. L., Veligzhanin A. A., Trigub A. L., Ovchinnikov S. G.
Заглавие : Study of mixed-valence Mn2BO4 using XRD, XPS and XAFS spectroscopies
Коллективы : Russian Foundation for Basic Research [17-02-00826, 16-32-60049]
Место публикации : Physica B. - 2019. - Vol. 560. - P.228-235. - ISSN 0921-4526, DOI 10.1016/j.physb.2019.02.019. - ISSN 1873-2135(eISSN)
Примечания : Cited References: 39. - This work has been financed by Russian Foundation for Basic Research (17-02-00826 and 16-32-60049 grant numbers).
Предметные рубрики: SPIN-GLASS BEHAVIOR
MAGNETIC-PROPERTIES
PROFILE REFINEMENT
Аннотация: The valence states and local structure around Mn atoms in mixed-valence Mn2BO4 have been studied by temperature dependent X-ray powder diffraction (XRPD), X-ray photoelectron (XPS) and Mn K-edge X-ray absorption (XAFS) spectroscopies measurements. X-ray absorption near-edge structure (XANES) and XPS have been used to measure the average oxidation state of Mn in bulk and near-surface of the material. The edge position, peak shapes and pre-edge features of Mn K-edge XANES spectra have been discussed. The pronounced temperature dependence of the Debye-Waller (DW) factor corresponding to the MnO coordination shell has been found from the extended x-ray absorption fine structure (EXAFS) analysis and has been associated with variations in the local distortions in MnO6 octahedra and emergence of short-range magnetic correlations at low temperatures. The XRPD measurements have been carried out at 298, 523 and 773 K. The monoclinic symmetry (P21/n) was found to persist up to highest temperature measured. The BVS calculations have revealed large valence difference between two manganese sites that strongly supports the presence of charge ordering up to high temperatures.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Platunov M. S., Kazak N. V., Dudnikov V. A., Temerov V. L., Gudim I. A., Knyazev Yu. V., Gavrilkin S. Yu., Dyadkin, Vadim, Dovgaliuk, Iurii, Chernyshov, Dmitry, Hen, Amir, Wilhelm, Fabrice, Rogalev, Andrei, Ovchinnikov S. G.
Заглавие : Element selective magnetism in Ho0.5Nd0.5Fe3(BO3)4 single crystal probed with hard X-ray magnetic circular dichroism
Коллективы : Russian Foundation for Basic Research [16-32-60049, 17-02-00826, 18-42-243007]; Foundation for Assistance to Small Innovative Enterprises (FASIE, UMNIK program)
Место публикации : J. Magn. Magn. Mater. - 2019. - Vol. 479. - P.312-316. - ISSN 0304-8853, DOI 10.1016/j.jmmm.2019.02.040. - ISSN 1873-4766(eISSN)
Примечания : Cited References: 40. - The study was supported in part by the grants of the Russian Foundation for Basic Research (project Nos. 16-32-60049, 17-02-00826, 18-42-243007) and the Foundation for Assistance to Small Innovative Enterprises (FASIE, UMNIK program). The magnetic measurements were carried out in the Shared Facility Centre of P.N. Lebedev Physical Institute of RAS. We are grateful to Dr. Alexey Bosak for providing assistance of the structural experiments on the ID28 beamline. We are also grateful to Dr. Evgeniy Eremin from Kirensky Institute of Physics for providing the results of magnetic measurements and for useful discussions. The authors thank the ID12 beamline staffs for help during the XMCD experiment and also gratefully acknowledge the beamtime provision (proposal HC-1804) by the ESRF.
Предметные рубрики: MICROSTRUCTURE
TRANSITIONS
ND
Ключевые слова (''Своб.индексиров.''): x-ray magnetic circular dichroism--x-ray absorption--magnetic properties
Аннотация: We present a study of a Ho0.5Nd0.5Fe3(BO3)4 single crystal aiming at understanding the roles of each magnetic sublattices in magnetic transitions at low temperatures. The crystal structure is determined to have the R32 symmetry in whole studied temperature range but the crystal appears to be racemic. Element selective magnetic properties studied with X-ray magnetic circular dichroism at the L2,3-edges of Ho and Nd, and at the Fe K-edge at T = 3 K under magnetic fields of ±17 T are compared with the results of macroscopic magnetization measurements in pure and substituted crystals. All three magnetic sublattices are shown to be strongly coupled and to undergo a spin-reorientation transition when magnetic field is applied along the trigonal c-axis. On the contrary, when magnetic field is applied in the ab-plane only the holmium atoms exhibit a sizeable magnetization jump. This result allows us to conclude that the spin-flop transitions observed in macroscopic magnetization curves and associated anomalies of electric polarization are due to the Ho3+ magnetic moment reorientation.
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