Abstract
We report on a comparative study of spin Hall related effects and magnetoresistance in YIGPt and YIGTa bilayers. These combined measurements allow to estimate the characteristic transport parameters of both Pt and Ta layers juxtaposed to yttrium iron garnet (YIG): the spin mixing conductance at the YIGnormal metal interface, the spin Hall angle , and the spin diffusion length in the normal metal. The inverse spin Hall voltages generated in Pt and Ta by the pure spin current pumped from YIG excited at resonance confirm the opposite signs of spin Hall angles in these two materials. Moreover, from the dependence of the inverse spin Hall voltage on the Ta thickness, we extract the spin diffusion length in Ta, found to be nm. Both the YIGPt and YIGTa systems display a similar variation of resistance upon magnetic field orientation, which can be explained in the recently developed framework of spin Hall magnetoresistance.
- Received 18 February 2013
DOI:https://doi.org/10.1103/PhysRevB.87.174417
©2013 American Physical Society
Viewpoint
Insulating Magnets Control Neighbor’s Conduction
Published 13 May 2013
A newly discovered type of magnetoresistance, resulting from spin-dependent scattering at a metal-magnet interface, may potentially be used to study the magnetization in insulating magnets or to develop new spintronic devices.
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