Large Spin Pumping from Epitaxial Y3Fe5O12 Thin Films to Pt and W Layers

TL;DR

This study demonstrates large spin pumping signals from high-quality epitaxial Y3Fe5O12 thin films into Pt and W layers, with significant inverse spin Hall voltages observed under cavity ferromagnetic resonance.

Contribution

It reports the fabrication of epitaxial Y3Fe5O12 films with excellent crystalline quality and quantifies their spin pumping efficiency into Pt and W layers, a novel achievement in the field.

Findings

Inverse spin Hall voltages of 2.10 mV (Pt) and -5.26 mV (W) measured.

Interfacial spin mixing conductance values of 4.56E14 and 2.30E14 {}^-2 m^-2 obtained.

High-quality epitaxial films enable large spin pumping signals.

Abstract

Epitaxial Y3Fe5O12 thin films have been deposited by off-axis sputtering, which exhibit excellent crystalline quality, enabling observation of large spin pumping signals in Pt/Y3Fe5O12 and W/Y3Fe5O12 bilayers driven by cavity ferromagnetic resonance. The inverse spin Hall voltages reach 2.10 mV and -5.26 mV in 5-mm long Pt/Y3Fe5O12 and W/Y3Fe5O12 bilayers, respectively, excited by a radio-frequency magnetic field of 0.3 Oe. From the ferromagnetic resonance linewidth broadening, the interfacial spin mixing conductance of 4.56E14 {\Omega}-1m-2 and 2.30E14 {\Omega}-1m-2 are obtained for Pt/Y3Fe5O12 and W/Y3Fe5O12 bilayers, respectively.