The origin of spin current in YIG/nonmagnetic metal multilayers at ferromagnetic resonance |
(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. |