Dynamical Skyrmion State in a Spin Current Nano-Oscillator with Perpendicular Magnetic Anisotropy

被引：95
作者：
Liu, R. H. [1 ]
Lim, W. L. [1 ]
Urazhdin, S. [1 ]
机构：
[1] Emory Univ, Dept Phys, Atlanta, GA 30322 USA
来源：
PHYSICAL REVIEW LETTERS | 2015年 / 114卷 / 13期
基金：
美国国家科学基金会;
关键词：
DRIVEN; EXCITATION;
D O I：
10.1103/PhysRevLett.114.137201
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We study the spectral characteristics of spin current nano-oscillators based on the Pt/[Co/Ni] magnetic multilayer with perpendicular magnetic anisotropy. By varying the applied magnetic field and current, both localized and propagating spin wave modes of the oscillation are achieved. At small fields, we observe an abrupt onset of the modulation sidebands. We use micromagnetic simulations to identify this state as a dynamical magnetic skyrmion stabilized in the active device region by spin current injection, whose current-induced dynamics is accompanied by the gyrotropic motion of the core due to the skew deflection. Our results demonstrate a practical route for controllable skyrmion manipulation by spin current in magnetic thin films.
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页数：6
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