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19 April 2024 |
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Article overview
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Ferroelectric Skyrmions and a Zoo of Multiferroic Phases in GaV4S8 | | E. Ruff
; S. Widmann
; P. Lunkenheimer
; V. Tsurkan
; S. Bordács
; I. Kézsmárki
; A. Loidl
; | | Date: |
1 Apr 2015 | | Abstract: | The lacunar spinel GaV4S8 undergoes orbital ordering at 44 K and reveals a
complex magnetic phase diagram below 13 K, including a ferromagnetic, cycloidal
and N’eel-type skyrmion lattice phase. Skyrmions are topologically protected
nano-scale spin vortices with fascinating physical properties and high
potential for future data storage. Here we provide a detailed study of the
polar properties of GaV4S8, revealing that its orbitally ordered phase is
ferroelectric with sizable polarization of ~ 1 {mu}C/cm^2. Moreover,
spin-driven excess polarizations emerge in all magnetic phases, hence, GaV4S8
hosts three different multiferroic phases including the skyrmion lattice formed
by ferroelectric spin vortices. By taking into account the crystal symmetry and
spin patterns of the magnetically ordered phases, exchange striction is
identified as the main microscopic mechanism behind the spin-driven
ferroelectric polarization in each multiferroic phase. The polar crystal
structure of GaV4S8 is unique among the known skyrmion-lattice host materials
and the ferroelectric SkL phase may be exploited for non-dissipative
electric-field control of skyrmions. | | Source: | arXiv, 1504.0309 | | Services: | Forum | Review | PDF | Favorites | |
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