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.

中文翻译：

---

Pt/Y3Fe5O12异质结构中电流控制的磁振子传播

我们提出了一种动态自旋波 (SW) 调制技术，使用直流电 (DC) 来操纵超低阻尼 Y3Fe5O12 薄膜的磁性。在 Y3Fe5O12 (YIG) 表面上具有两个共面波导天线布置的微波激发和检测技术用于表征 SW。连接到电流源的额外铂 (Pt) 条带集成在共面波导对之间，以演示通过电流感应进行的 SW 谐振频率和幅度调制。我们选择了 Pt 条纹，因为它具有显着较低的自旋波吸收特性。电流通过 Pt 条纹会产生局部焦耳热，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 膜的饱和磁化强度，其中，反过来，调制 SW 频率。此外，发现 SW 谱的幅度可以通过电流幅度进行调整。这种现象主要通过局部加热情况下自旋塞贝克效应引起的磁振子-磁振子散射来描述。此外，还发现所提出的器件的群速度对电流有响应，这可以通过磁子 - 磁子和磁子 - 声子散射来解释。