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
期刊:
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
Xiuzhen Yu;K. Shibata;W. Koshibae;Y. Tokunaga;Y. Kaneko;T. Nagai;K. Kimoto;Y. Taguchi;N. Nagaosa;Y. Tokura
中科院分区:
物理与天体物理2区
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

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具有缠绕数的磁泡与skyrmions拓扑等价。在这里,我们报告的螺旋度(面内磁化旋转方向)反转的skyrmions的发现,同时保持其六方晶格的形式,在室温以上的薄六角铁氧体磁体。我们已经观察到,螺旋反转的频率显着增加,随着温度的热激活的方式,揭示了一个扭结孤子对的生成能量的开关螺旋上的skyrmion迅速下降的磁转变温度。
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.