The origin of spin current in YIG/nonmagnetic metal multilayers at ferromagnetic resonance
Kang Yun1, Zhong Hai1, Hao Runrun1, Hu Shujun1, Kang Shishou1, †, Liu Guolei1, Zhang Yin2, Wang Xiangrong2, ‡, Yan Shishen1, Wu Yong3, Yu Shuyun1, Han Guangbing1, Jiang Yong3, Mei Liangmo1
       

(color online) (a) The experimental setup for the microwave absorption measurement and electrical detection of FMR in which DC-voltage along the long edge of the sample was measured. (b) The zoom-in of sample and copper-pads. The total thickness of the sample including GGG substrate is about 1 mm. (c) The in-plane rotation geometry of sample. The microwave of frequency f = 9.7 GHz propagated along the z axis, and the external field H was along the x axis. e and h are the electric and magnetic components of the microwave, respectively along the x axis and the y axis. The angle between the y axis and the long edge of sample was denoted as θ that varies as the shorted copper plate rotates in the xy-plane. (d) FMR signals of 3-nm Py thin film strip when the Al wires were connected/disconnected to the Cu-pads (with/without antenna effect). The inset is the equivalent circuit with antenna effect.