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arXiv · 1704.06714

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

Christian Stamm·Christoph Murer·Marco Berritta·Junxiao Feng·Mihai Gabureac·Peter M. Oppeneer·Pietro Gambardella
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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 $5*10^{-12} μ_B$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.

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Christian Stamm, Christoph Murer, Marco Berritta, Junxiao Feng, Mihai Gabureac, Peter M. Oppeneer, Pietro Gambardella. 2017-06-27. Magneto-Optical Detection of the Spin Hall Effect in Pt and W Thin Films. https://doi.org/10.1103/physrevlett.119.087203

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