Abstract
The spin pumping effect of the Ni80Fe20/Rut bilayers was studied by ferromagnetic resonance method. A shutter shift technique was adopted to prepare the wedge-like Ru caplayer on the Ni80Fe20 film with homogeneous thickness and damping constant. Thanks to this special preparation method, the very tiny variation of damping constant due to the spin pumping at the Ni80Fe20/Rut interface was precisely measured and extracted from that of Ni80Fe20 films. Comparing with the conventional monotonically approaching saturation curve of damping constant vs. non-magnetic Ru layer thickness tRu, an additional damping peak was observed. The abnormal damping-tRu curves can be understood as the combined action of spin pumping at Ni80Fe20/Rut interface and spin back flow due to the reflection at Ru surface and Ru/Ni80Fe20 interface.
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