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

Authors :: Wang, H. L.
Du, C. H.
Pu, Y.
Adur, R.
Hammel, P. C.
Yang, F. Y.
Source :: Phys. Rev. B 88, 100406(R) (2013)
Publication Year :: 2013
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.<br />Comment: 20 pages 4 figures