Article (Scientific journals)
Critical size limits for collinear and spin-spiral magnetism in $CoCr_2\mathrmO_4$
Zákutná, D.; Alemayehu, A.; Vlček et al.
2019In Physical Review. B, Condensed Matter and Materials Physics, 100, p. 184427
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Keywords :
neutron diffraction; Multiferroics; Magnetic phase transition
Abstract :
[en] The multiferroic behavior of CoCr2O4 results from the appearance of conical spin-spiral magnetic ordering, which induces electric polarization. The magnetic ground state has a complex size-dependent behavior, which collapses when reaching a critical particle size. Here the magnetic phase stability of CoCr2O4 in the size range of 3.6–14.0 nm is presented in detail using the combination of neutron diffraction with XYZ polarization analysis and macroscopic magnetization measurements. We establish critical coherent domain sizes for the formation of the spin spiral and ferrimagnetic structure and reveal the evolution of the incommensurate spin spiral vector with particle size. We further confirm the presence of ferroelectric polarization in the spin spiral phase for nanocrystalline CoCr2O4.
Disciplines :
Physics
Author, co-author :
Zákutná, D.
Alemayehu, A.
Vlček
Nemkovski, K.
Grams, C. P.
Nižňanský
Honecker, Dirk ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit
Disch, S.
External co-authors :
yes
Language :
English
Title :
Critical size limits for collinear and spin-spiral magnetism in $CoCr_2\mathrmO_4$
Publication date :
2019
Journal title :
Physical Review. B, Condensed Matter and Materials Physics
ISSN :
1550-235X
Publisher :
American Physical Society
Volume :
100
Pages :
184427
Peer reviewed :
Peer Reviewed verified by ORBi
Focus Area :
Physics and Materials Science
Available on ORBilu :
since 27 November 2019

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