Full Control of the Spin-Wave Damping in a Magnetic Insulator Using Spin-Orbit Torque
Full Control of the Spin-Wave Damping in a Magnetic Insulator Using Spin-Orbit Torque
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DOI：
10.1103/physrevlett.113.197203
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发表时间：
2014-11-07
影响因子：
8.6
通讯作者：
Klein, O.
中科院分区：
文献类型：
--
作者：
Hamadeh, A.;Kelly, O. d'Allivy;Klein, O.
结果表明，在直径为5 μ m的YIG（20 nm）垂直栅Pt（7 nm）盘中，可以达到阻尼补偿的阈值电流。演示依赖于测量的铁磁共振线宽作为一个功能的I-DC使用磁共振力显微镜（MRFM）。它示出的磁性绝缘体中存在的自旋波模式的磁损耗可以减少或增强的至少一个因素的5取决于极性和强度的面内直流电流I-DC流经相邻的正常金属与强自旋轨道相互作用。对于类似于3 × 10（11）A的电流密度，通过自旋-轨道力矩实现了对基模阻尼的完全补偿。m（-2），与理论预测一致。在此临界阈值下，MRFM检测到静态磁化的微小变化，这是与自振荡机制的开始一致的行为。
It is demonstrated that the threshold current for damping compensation can be reached in a 5 mu m diameter YIG(20 nm)vertical bar Pt(7 nm) disk. The demonstration rests upon the measurement of the ferromagnetic resonance linewidth as a function of I-dc using a magnetic resonance force microscope (MRFM). It is shown that the magnetic losses of spin-wave modes existing in the magnetic insulator can be reduced or enhanced by at least a factor of 5 depending on the polarity and intensity of an in-plane dc current I-dc flowing through the adjacent normal metal with strong spin-orbit interaction. Complete compensation of the damping of the fundamental mode by spin-orbit torque is reached for a current density of similar to 3 x 10(11) A . m(-2), in agreement with theoretical predictions. At this critical threshold the MRFM detects a small change of static magnetization, a behavior consistent with the onset of an auto-oscillation regime.