Enhanced spin pumping at yttrium iron garnet/Au interfaces

Applied Physics Letters - Tập 100 Số 9 - 2012
C. Burrowes1, B. Heinrich1, B. Kardasz1, Eric Montoya1, Erol Girt1, Yiyan Sun2, Young‐Yeal Song2, Mingzhong Wu2
1Physics Department, Simon Fraser University, 8888 University Dr. 1 , Burnaby, British Columbia V5A 1S6, Canada
2Physics Department, Colorado State University 2 , Fort Collins, Colorado 80523, USA

Tóm tắt

Spin injection across the ferrimagnetic insulator yttrium iron garnet (YIG)/normal metal Au interface was studied using ferromagnetic resonance. The spin mixing conductance was determined by comparing the Gilbert damping parameter α in YIG/Au and YIG/Au/Fe heterostructures. The main purpose of this study was to correlate the spin pumping efficiency with chemical modifications of the YIG film surface using in situ etching and deposition techniques. By means of Ar+ ion beam etching, one is able to increase the spin mixing conductance at the YIG/Au interface by a factor of 5 compared to the untreated YIG/Au interface.

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Applied Physics Letters

Tập 100 Số 9

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