Terahertz Antiferromagnetic Spin Hall Nano-Oscillator

被引：239

作者：

Cheng, Ran ^{[1
]}

Xiao, Di ^{[1
]}

Brataas, Arne ^{[2
]}

机构：

[1] Carnegie Mellon Univ, Dept Phys, Pittsburgh, PA 15213 USA

[2] Norwegian Univ Sci & Technol, Dept Phys, NO-7491 Trondheim, Norway

来源：

PHYSICAL REVIEW LETTERS | 2016年 / 116卷 / 20期

关键词：

MAGNETIC MULTILAYERS; DRIVEN; INSULATOR; RESONANCE;

D O I：

10.1103/PhysRevLett.116.207603

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We consider the current-induced dynamics of insulating antiferromagnets in a spin Hall geometry. Sufficiently large in-plane currents perpendicular to the Neel order trigger spontaneous oscillations at frequencies between the acoustic and the optical eigenmodes. The direction of the driving current determines the chirality of the excitation. When the current exceeds a threshold, the combined effect of spin pumping and current-induced torques introduces a dynamic feedback that sustains steady-state oscillations with amplitudes controllable via the applied current. The ac voltage output is calculated numerically as a function of the dc current input for different feedback strengths. Our findings open a route towards terahertz antiferromagnetic spin-torque oscillators.

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页数：5

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