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Mode locking phenomena of the current-induced skyrmion-lattice motion in microfabricated MnSi
Physical Review B ( IF 3.7 ) Pub Date : 2020-11-25 , DOI: 10.1103/physrevb.102.180411
Takuro Sato , Akiko Kikkawa , Yasujiro Taguchi , Yoshinori Tokura , Fumitaka Kagawa

Using voltage fluctuation spectroscopy, we observe the mode locking phenomena of current-induced skyrmion-lattice motion in microfabricated MnSi. When only a dc electric current is applied, the frequency of the emergent narrow-band noise (NBN) monotonously increases with increasing dc current. By contrast, if an ac electric current is further added, the NBN frequency becomes much less dependent on the dc current when it satisfies a simple integer ratio to the ac current frequency, a hallmark of mode locking. In the mode locked state, the linewidth of the NBN is sharpened, indicating the enhanced coherence of the skyrmion-lattice motion. The overall features of the mode locking phenomena are qualitatively reproduced within the framework of the classical rigid-sphere model.

中文翻译:

微细加工的MnSi中电流引起的Skyrmion晶格运动的锁模现象

使用电压波动光谱,我们观察了微细加工的MnSi中电流引起的Skyrmion晶格运动的锁模现象。当仅施加直流电流时,出现的窄带噪声(NBN)的频率会随着直流电流的增加而单调增加。相反,如果进一步增加交流电流,则当NBN满足与交流电流频率的简单整数比时,NBN频率对直流电流的依赖性就会大大降低,这是锁模的标志。在锁模状态下,NBN的线宽变尖,表明天蝎子格网运动的相干性增强。在经典的刚性球体模型的框架内,定性地再现了锁模现象的整体特征。
更新日期:2020-11-25
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