Current-controlled magnon propagation in Pt/Y3Fe5O12 heterostructure
Current-controlled magnon propagation in Pt/Y3Fe5O12 heterostructure
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DOI：
10.1063/5.0019024
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发表时间：
2020-10-12
影响因子：
4
通讯作者：
Tabata, Hitoshi
中科院分区：
文献类型：
--
作者：
Sarker, Md Shamim;Yamahara, Hiroyasu;Tabata, Hitoshi
我们提出了一种利用直流(DC)的动态自旋波(SW)调制技术来控制超低阻尼Y3Fe5O12薄膜的磁性。采用在Y3Fe5O12(YIG)表面布置两个共面波导天线的微波激励和探测技术来表征表面波。在共面波导对之间集成了一个连接到电流源的额外的铂(铂)条，以演示通过电流感应进行的短波谐振频率和幅度调制。我们选择了一种铂条，因为它的自旋波吸收性能明显较低。通过铂条施加电流会产生局部焦耳加热，从而改变YIG薄膜的磁性。通过局部加热引起的温度变化改变了YIG薄膜的饱和磁化强度，而YIG薄膜的饱和磁化强度反过来又调制了高频。此外，还发现波谱的幅度被电流幅度所调谐。在局域加热的情况下，这种现象主要由自旋Seebeck效应引起的磁振子-磁振子散射所描述。此外，我们还发现该器件的群速度对电流有响应，这可以用磁振子-磁振子散射和磁振子-声子散射来解释。
We present a dynamic spin wave (SW) modulation technique using direct current (DC) to manipulate the magnetic properties of an ultralow-damping Y3Fe5O12 thin film. The microwave excitation and detection technique with two coplanar waveguide antenna arrangements on the Y3Fe5O12 (YIG) surface is used to characterize the SW. An additional platinum (Pt) stripe connected to a current source is integrated between the coplanar waveguide pair to demonstrate the SW resonant frequency and amplitude modulation by current induction. We selected a Pt stripe due to its significantly lower spin wave absorption property. The application of current through the Pt stripe generates local joule heating that modifies the magnetic properties of the YIG film. Temperature variation through local heating modifies the saturation magnetization of the YIG film, which, in turn, modulates the SW frequency. Moreover, the amplitude of the SW spectra is found to be tuned by the current amplitude. This phenomenon is mainly described by magnon-magnon scattering induced by the spin Seebeck effect in the case of local heating. Furthermore, the group velocity of the proposed device is also found to be responsive to the current, which has been explained by both magnon-magnon and magnon-phonon scattering.