Generation of coherent spin-wave modes in yttrium iron garnet microdiscs by spin-orbit torque.
Generation of coherent spin-wave modes in yttrium iron garnet microdiscs by spin-orbit torque.
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DOI：
10.1038/ncomms10377
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发表时间：
2016-01-27
影响因子：
16.6
通讯作者：
Klein O
中科院分区：
文献类型：
--
作者：
Collet M;de Milly X;d'Allivy Kelly O;Naletov VV;Bernard R;Bortolotti P;Ben Youssef J;Demidov VE;Demokritov SO;Prieto JL;Muñoz M;Cros V;Anane A;de Loubens G;Klein O
近年来，自旋 - 轨道效应已被广泛用于生产和检测自旋装置中的自旋电流。磁绝缘子可以导致从金属流入绝缘体的净纯自旋电流。量身定制这种实验是由于模式竞争而被证明是难以捉摸的。厚度为20 nm的微米大小的Yttrium铁石榴盘的振荡强调了准脱位自旋波模式的关键作用，从而增加了阈值。
旋转轨道相互作用使纯自旋电流从电流的重金属中注射到铁磁绝缘子中，从而在此处产生扭矩，作者证明了磁性自动震荡，这是由薄膜微型证动的旋转驱动器驱动的Yttrium铁石榴石。
In recent years, spin–orbit effects have been widely used to produce and detect spin currents in spintronic devices. The peculiar symmetry of the spin Hall effect allows creation of a spin accumulation at the interface between a metal with strong spin–orbit interaction and a magnetic insulator, which can lead to a net pure spin current flowing from the metal into the insulator. This spin current applies a torque on the magnetization, which can eventually be driven into steady motion. Tailoring this experiment on extended films has proven to be elusive, probably due to mode competition. This requires the reduction of both the thickness and lateral size to reach full damping compensation. Here we show clear evidence of coherent spin–orbit torque-induced auto-oscillation in micron-sized yttrium iron garnet discs of thickness 20 nm. Our results emphasize the key role of quasi-degenerate spin-wave modes, which increase the threshold current. Spin-orbit interactions allow for pure spin current to be injected into a ferromagnetic insulator from a current-carrying heavy metal, generating torque on the magnetization. Here, the authors evidence magnetic auto-oscillations driven by spin-orbit torque in thin film microdiscs of yttrium iron garnet.