Abstract
We performed direct microwave power injection into Pt/YIG, a heavy metal/ferrimagnetic insulator bilayer structure. The induced heating effect plays an important role in the interpretation of the ferromagnetic resonance signal. According to our frequency dependent measurements, we found the heat-induced inhomogeneous broadening in addition to the spin Hall magnetoresistance (SMR). From the angular dependent measurement, the thermal signals both in non-resonant and resonant states were observed, consistent with the angular dependence of longitudinal spin Seebeck signal. The heating effect from the injected rf power not only gives rise to the increase of inhomogeneous broadening factor ΔH0, but also contributes to the increase of damping constant, Δα.
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