Large spin pumping from epitaxial Y3Fe5O12 thin films to Pt and W layers.

Epitaxial Y3Fe5O12 thin films deposited by off-axis sputtering 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 and --5.26 mV in 5-mm-long Pt/Y3Fe5O12 and W/Y3FesO12 bilayers, respectively, excited by a radio-frequency magnetic field of 0.3 Oe. From the ferromagnetic resonance linewidth broadening, we obtain high interfacial spin mixing conductances of 4.56 × 1014 and 2.30 × 1014 Ω-1 m-2 for Pt/Y3Fe5O12and W/Y3Fe5O12 bilayers, respectively. [ABSTRACT FROM AUTHOR]