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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Nasirpouri F., Peighambari S. M., Samardak A. S., Ognev A. V., Sukovatitsina E. V., Modin E. B., Chebotkevich L. A., Komogortsev S. V., Bending S. J.
Заглавие : Electrodeposited Co93.2P6.8 nanowire arrays with core-shell microstructure and perpendicular magnetic anisotropy
Коллективы : Russian Ministry of Education and Science [559]; Far Eastern Federal University
Место публикации : J. Appl. Phys.: American Institute of Physics, 2015. - Vol. 117, Is. 17. - Ст.17E715. - ISSN 0021, DOI 10.1063/1.4919124. - ISSN 10897550(eISSN)
Примечания : Cited References:30. - Alexander Samardak and his colleagues acknowledge the support of the Russian Ministry of Education and Science under the state task 559 and Far Eastern Federal University.
Предметные рубрики: FERROMAGNETIC NANOWIRES
STRUCTURAL-PROPERTIES
NI
ALUMINA
FE
Аннотация: We demonstrate the formation of an unusual core-shell microstructure in Co93.2P6.8 nanowires electrodeposited by alternating current (ac) in an alumina template. By means of transmission electron microscopy, it is shown that the coaxial-like nanowires contain amorphous and crystalline phases. Analysis of the magnetization data for Co-P alloy nanowires indicates that a ferromagnetic core is surrounded by a weakly ferromagnetic or non-magnetic phase, depending on the phosphor content. The nanowire arrays exhibit an easy axis of magnetization parallel to the wire axis. For this peculiar composition and structure, the coercivity values are 2380 ± 50 and 1260 ± 35 Oe, parallel and perpendicular to the plane directions of magnetization, respectively. This effect is attributed to the core-shell structure making the properties and applications of these nanowires similar to pure cobalt nanowires with an improved perpendicular anisotropy.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Rasch JCE, Boehm M., Ritter C., Mutka H., Schefer J., Keller L., Abramova G. M., Cervellino A., Loffler J. F.
Заглавие : Magnetoelastic coupling in the triangular lattice antiferromagnet CuCrS2
Коллективы : Russian Academy of Science (RAS), Siberian Branch [06-1000013-9002]
Место публикации : Phys. Rev. B. - 2009. - Vol. 80, Is. 10. - Ст.104431. - ISSN 1098-0121, DOI 10.1103/PhysRevB.80.104431
Примечания : Cited References: 30. - We are grateful for support and allocated beam time at the Institut Laue-Langevin (D1A, IN3),Grenoble, France, the spallation neutron source SINQ (TriCS, DMC) and the SLS-MS beamline, both Paul Scherrer Insitut, Villigen, Switzerland. This work was supported by INTAS Grant No. 06-1000013-9002 of the Russian Academy of Science (RAS), Siberian Branch.
Предметные рубрики: NEUTRON POWDER DIFFRACTION
MAGNETIC-STRUCTURE
STRUCTURAL-PROPERTIES
PHASE-TRANSITION
SOLID OXYGEN
ALPHA-PHASES
BETA-PHASES
SELENIDES
SULFIDES
Аннотация: CuCrS2 is a triangular lattice Heisenberg antiferromagnet with a rhombohedral crystal structure. We report on neutron and synchrotron powder diffraction results which reveal a monoclinic lattice distortion at the magnetic transition and verify a magnetoelastic coupling. CuCrS2 is therefore an interesting material to study the influence of magnetism on the relief of geometrical frustration.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Shtarev D. S., Ryabchuk V. K., Rudakova A. V., Shtareva A. V., Molokeev M. S., Kirichenko E. A., Serpone N.
Заглавие : Phenomenological rule from correlations of conduction/valence band energies and bandgap energies in semiconductor photocatalysts: calcium bismuthates versus strontium bismuthates
Коллективы : Russian Science FoundationRussian Science Foundation (RSF) [19-73-10013]; Saint-Petersburg State University [39054581]
Место публикации : ChemCatChem. - 2020. - Vol. 12, Is. 6. - P.1551-1555. - ISSN 1867-3880, DOI 10.1002/cctc.201902236. - ISSN 1867-3899(eISSN)
Примечания : Cited References: 13. - The research was supported from a grant from the Russian Science Foundation (project No. 19-73-10013). We are very grateful to the staff of the Khabarovsk Innovation and Analytical Center of the Yu. A. Kosygin Institute of Tectonics and Geophysics FEB RAS, and of the Research Center on Nanophotonics and the Center for Physical Methods of Surface Investigation (to Dr. Alexandra Koroleva) of the Research Park at Saint-Petersburg State University for their valuable assistance in carrying out the research and in providing the needed equipment. VKR and AVR acknowledge financial support from a grant by the Saint-Petersburg State University (Pure ID 39054581). One of us (NS) thanks Prof. A. Albini and the staff of the PhotoGreen Laboratory of the University of Pavia for their continued hospitality
Предметные рубрики: STRUCTURAL-PROPERTIES
Аннотация: A number of calcium bismuthates were synthesized (25 to 50 mol% in Ca) and characterized by XRD, SEM, EDX, XPS and DRS techniques; the latter provided an estimate of the bandgap energies (Ebg=2.41 to 3.29 eV) via Tauc plots for indirect transitions, whereas XPS established the potentials (vs NHE) of their respective valence bands (and thus the conduction bands). Linear correlations existed between EVB/ECB and Ebg that when compared with those of strontium bismuthates (reported earlier) showed that differences in energies at Ebg=0 eV are related to the difference in the absolute electronegativities of Ca and Sr, from which the following empirical phenomenological rule is postulated: replacing one alkaline earth metal in bismuthates by another causes the points of intersection of the linear correlations ECB(Ebg) and EVB(Ebg) to be displaced by an amount equal to twice the difference in absolute electronegativities of these metals.
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