Published in
IOP Publishing, Journal of Physics D: Applied Physics, 2(48), p. 025001
DOI: 10.1088/0022-3727/48/2/025001
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Sign of inverse spin Hall voltages generated by ferromagnetic resonance and temperature gradients in yttrium iron garnet platinum bilayers
,
Alexander A. Serga ,
Shunsuke Daimon,
Takashi Kikkawa,
Eiji Saitoh,
Bart J. van Wees,
Burkard Hillebrands,
Rudolf Gross
and other authors.
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Abstract
We carried out a concerted effort to determine the absolute sign of the inverse spin Hall effect voltage generated by spin currents injected into a normal metal. We focus on yttrium iron garnet (YIG)∣platinum bilayers at room temperature, generating spin currents by microwaves and temperature gradients. We find consistent results for different samples and measurement setups that agree with theory. We suggest a right-hand-rule to define a positive spin Hall angle corresponding to the voltage expected for the simple case of scattering of free electrons from repulsive Coulomb charges.