Magneto-Optical Detection of the Spin Hall Effect in Pt and W Thin Films

Abstract

Here we report the measurement of the interfacial spin accumulation induced by the spin Hall effect in Pt and W thin films using magneto-optical Kerr microscopy. We show that the Kerr rotation has opposite sign in Pt and W and scales linearly with current density. By comparing the experimental results with ab-initio calculations of the spin Hall and magneto-optical Kerr effects, we quantitatively determine the current-induced spin accumulation at the Pt interface as $5\ast 10^{-12}{\mu }_B$A${}^{-1}$cm${}^2$ per atom. From thickness-dependent measurements, we determine the spin diffusion length in a single Pt film to be $11\pm 3$ nm, which is significantly larger compared to that of Pt adjacent to a magnetic layer.

16 pages including Supplemental Material

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• Direct electronic measurement of the spin Hall effect
• Theory of spin Hall magnetoresistance
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• Spin Transport at Interfaces with Spin-Orbit Coupling: Phenomenology
• Interface enhancement of Gilbert damping from first-principles
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• Optical detection of spin transport in non-magnetic metals

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