Reference : Critical size limits for collinear and spin spiral magnetism in CoCr$_2$O$_4$
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Physics
Physics and Materials Science
Critical size limits for collinear and spin spiral magnetism in CoCr$_2$O$_4$
Zákutná, Dominika [> >]
Alemayehu, Adam [> >]
Vlček, Jan [> >]
Nemkovski, Kirill [> >]
Grams, Christoph P. [> >]
Nižňanský, Daniel [> >]
Honecker, Dirk mailto [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit]
Disch, Sabrina [> >]
Physical Review. B, Condensed Matter and Materials Physics
[en] Condensed Matter - Mesoscale and Nanoscale Physics
[en] The multiferroic behavior of CoCr$_2$O$_4$ 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 CoCr$_2$O$_4$ 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 CoCr$_2$O$_4$. <P />

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