Controlled nonlinear magnetic damping in spin-Hall nano-devices

被引：48
作者：
Divinskiy, Boris [1 ,2 ]
Urazhdin, Sergei [3 ]
Demokritov, Sergej O. [1 ,2 ]
Demidov, Vladislav E. [1 ,2 ]
机构：
[1] Univ Munster, Inst Appl Phys, Corrensstr 2-4, D-48149 Munster, Germany
[2] Univ Munster, Ctr Nonlinear Sci, Corrensstr 2-4, D-48149 Munster, Germany
[3] Emory Univ, Dept Phys, Atlanta, GA 30322 USA
来源：
NATURE COMMUNICATIONS | 2019年 / 10卷 / 1期
基金：
美国国家科学基金会;
关键词：
D O I：
10.1038/s41467-019-13246-7
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
Large-amplitude magnetization dynamics is substantially more complex compared to the low-amplitude linear regime, due to the inevitable emergence of nonlinearities. One of the fundamental nonlinear phenomena is the nonlinear damping enhancement, which imposes strict limitations on the operation and efficiency of magnetic nanodevices. In particular, nonlinear damping prevents excitation of coherent magnetization auto-oscillations driven by the injection of spin current into spatially extended magnetic regions. Here, we propose and experimentally demonstrate that nonlinear damping can be controlled by the ellipticity of magnetization precession. By balancing different contributions to anisotropy, we minimize the ellipticity and achieve coherent magnetization oscillations driven by spatially extended spin current injection into a microscopic magnetic disk. Our results provide a route for the implementation of efficient active spintronic and magnonic devices driven by spin current.
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页数：7
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