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We have studied the film thickness dependence of the current-inducedmagneto-optical Kerr effect in Pt and V thin films. The Kerr signal for Ptshows little dependence on the thickness in the range studied (20-80 nm). Incontrast, the signal for V increases with increasing thickness and saturates ata thickness near 100 nm to a value significantly larger than that of Pt. Theseexperimental results are accounted for assuming that spin and orbital Halleffects are responsible for the Kerr signal. We show that the Kerr signal isproportional to the product of the dc spin (orbital) Hall conductivity and theenergy derivative of the ac spin (orbital) Hall conductivity. Contributionsfrom the spin and orbital Hall effects mostly add up for V whereas they cancelout for Pt. Assuming that the orbital Hall conductivity matches that predictedfrom first-principles calculations, the thickness dependence of the Kerr signalsuggests that the orbital diffusion length of V is considerably smallercompared to its spin diffusion length.

Spin and orbital Hall currents detected via current induced magneto-optical Kerr effect in V and Pt