Switchable giant nonreciprocal frequency shift of propagating spin waves in synthetic antiferromagnets
Switchable giant nonreciprocal frequency shift of propagating spin waves in synthetic antiferromagnets
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DOI：
10.1126/sciadv.aaz6931
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发表时间：
2020-04
期刊：
影响因子：
13.6
通讯作者：
M. Ishibashi;Y. Shiota;Tian Li;S. Funada;T. Moriyama;T. Ono
中科院分区：
文献类型：
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作者：
M. Ishibashi;Y. Shiota;Tian Li;S. Funada;T. Moriyama;T. Ono
我们报道了合成反铁磁体中自旋波传播的巨非互易性和电开关。传播自旋波的非互易性，即，取决于传播方向的幅度和/或频率的差异对于实现基于自旋波的逻辑电路是必要的。然而，到目前为止，非互易频移证明是不够大的应用，因为它们源于界面效应。此外，自旋波非互易性的电开关仍然是一个具有挑战性的问题。在这里，我们展示了一个可切换的巨大的非互易性频率移动的层间交换耦合合成反铁磁体中传播的自旋波。所观察到的频移是由于两个磁性层之间的相互偶极相互作用所引起的大的不对称自旋波色散。此外，我们发现频移的符号取决于两个磁化的相对配置，基于此我们证明了非互惠性的电切换。我们的研究结果提供了一个可切换和高度非互易自旋波为基础的应用程序的路线。
We report the giant nonreciprocity and the electrical switching of propagating spin waves in synthetic antiferromagnets. The nonreciprocity of propagating spin waves, i.e., the difference in amplitude and/or frequency depending on the propagation direction, is essential for the realization of spin wave–based logic circuits. However, the nonreciprocal frequency shifts demonstrated so far are not large enough for applications because they originate from interfacial effects. In addition, switching of the spin wave nonreciprocity in the electrical way remains a challenging issue. Here, we show a switchable giant nonreciprocal frequency shift of propagating spin waves in interlayer exchange–coupled synthetic antiferromagnets. The observed frequency shift is attributed to large asymmetric spin wave dispersion caused by a mutual dipolar interaction between two magnetic layers. Furthermore, we find that the sign of the frequency shift depends on relative configuration of two magnetizations, based on which we demonstrate an electrical switching of the nonreciprocity. Our findings provide a route for switchable and highly nonreciprocal spin wave–based applications.