Abstract
We report the spin transmission enhancement at the YIG/Pt interface by inserting the subnanometer thick Ni81Fe19 (Py) layer, as clarified comprehensively by spin Hall magnetoresistance, spin pumping effect, and spin Seebeck effect measurements. Through comparative analysis of Py thickness dependent spin-mixing conductance G↑↓, the enhanced spin transmission can be directly attributed to the spin fluctuations due to the Py insertion instead of the interfacial magnetic moment density. Meanwhile, the spin current is partially suppressed by the spin memory loss process arising from the Py interlayer, leading to the overall attenuation of G↑↓ with thicker Py. As a result, the two competing processes caused by insert Py jointly modulate the spin transmission efficiency.
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