Giant nonreciprocal emission of spin waves in Ta/Py bilayers.
Giant nonreciprocal emission of spin waves in Ta/Py bilayers.
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DOI：
10.1126/sciadv.1501892
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发表时间：
2016-07
期刊：
影响因子：
13.6
通讯作者：
Yang H
中科院分区：
文献类型：
--
作者：
Kwon JH;Yoon J;Deorani P;Lee JM;Sinha J;Lee KJ;Hayashi M;Yang H
使用用于开关和逻辑应用的 Ta/Py 双层实现了强的不可逆自旋波发射。自旋波是磁性材料磁化中传播的扰动。它们有趣的特性之一是非互易性，表明它们的振幅取决于磁化方向。自旋波的非互易性在基础科学和应用中都引起了极大的兴趣，因为它为逻辑和开关应用技术领域提供了一个额外的旋钮来控制波的流动。我们展示了具有平面外磁场的 Ta/Py 双层系统的自旋波的高非互易性。非互易性取决于 Ta 底层的厚度，发现 Ta 底层的厚度会引起界面各向异性。观察到的高非互易性的根源有两个：由于倾斜面外各向异性的不同角度而导致面内磁化强度的不同极性以及 Ta/Py 界面处的自旋泵浦效应。我们的研究结果为设计高效、基于不可逆自旋波的应用提供了机会，例如不可逆微波器件、波角逻辑门和信息传输。
A strong nonreciprocal spin wave emission is realized using Ta/Py bilayers for switch and logic applications. Spin waves are propagating disturbances in the magnetization of magnetic materials. One of their interesting properties is nonreciprocity, exhibiting that their amplitude depends on the magnetization direction. Nonreciprocity in spin waves is of great interest in both fundamental science and applications because it offers an extra knob to control the flow of waves for the technological fields of logics and switch applications. We show a high nonreciprocity in spin waves from Ta/Py bilayer systems with out-of-plane magnetic fields. The nonreciprocity depends on the thickness of Ta underlayer, which is found to induce an interfacial anisotropy. The origin of observed high nonreciprocity is twofold: different polarities of the in-plane magnetization due to different angles of canted out-of-plane anisotropy and the spin pumping effect at the Ta/Py interface. Our findings provide an opportunity to engineer highly efficient, nonreciprocal spin wave–based applications, such as nonreciprocal microwave devices, magnonic logic gates, and information transports.