Thermally activated helicity reversals of skyrmions
Thermally activated helicity reversals of skyrmions
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DOI:
10.1103/physrevb.93.134417
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发表时间:
2016-04
影响因子:
3.7
通讯作者:
Xiuzhen Yu;K. Shibata;W. Koshibae;Y. Tokunaga;Y. Kaneko;T. Nagai;K. Kimoto;Y. Taguchi;N. Nagaosa;Y. Tokura
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文献类型:
--
作者:
Xiuzhen Yu;K. Shibata;W. Koshibae;Y. Tokunaga;Y. Kaneko;T. Nagai;K. Kimoto;Y. Taguchi;N. Nagaosa;Y. Tokura
Magnetic bubbles with winding numberare topologically equivalent to skyrmions. Here we report the discovery of helicity (in-plane magnetization-swirling direction) reversal of skyrmions, while keeping their hexagonal lattice form, at above room temperature in a thin hexaferrite magnet. We have observed that the frequency of helicity reversals dramatically increases with temperature in a thermally activated manner, revealing that the generation energy of a kink-soliton pair for switching helicity on a skyrmion rapidly decreases towards the magnetic transition temperature.