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This paper presents the frequency dependence of the spin current emission ina hybrid ferrimagnetic insulator/normal metal system. The system is based on aferrimagnetic insulating thin film of Yttrium Iron Garnet (YIG, 200 nm) grownby liquid-phase-epitaxy (LPE) coupled with a normal metal with a strongspin-orbit coupling (Pt, 15 nm). The YIG layer presents an isotropic behaviourof the magnetization in the plane, a small linewidth, and a roughness lowerthan 0.4 nm. Here we discuss how the voltage signal from the spin currentdetector depends on the frequency [0.6 - 7 GHz], the microwave power, Pin, [1 -70 mW], and the in-plane static magnetic field. A strong enhancement of thespin current emission is observed at low frequencies, showing the appearance ofnon-linear phenomena.

Frequency and power dependence of spin-current emission by spin pumping in a thin film YIG/Pt system