Determination of the Pt spin diffusion length by spin-pumping and spin Hall effect

Wei Zhang, Vincent Vlaminck, John E. Pearson, Ralu Divan, Samuel D. Bader, Axel Hoffmann

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141 Scopus citations

Abstract

The spin diffusion length of Pt at room temperature and at 8 K is experimentally determined via spin pumping and spin Hall effect in permalloy/Pt bilayers. Voltages generated during excitation of ferromagnetic resonance from the inverse spin Hall effect and anisotropic magnetoresistance effect were investigated with a broadband approach. Varying the Pt layer thickness gives rise to an evolution of the voltage line shape due to the superposition of the above two effects. By studying the ratio of the two voltage components with the Pt layer thickness, the spin diffusion length of Pt can be directly extracted. We obtain a spin diffusion length of ∼1.2 nm at room temperature and ∼1.6 nm at 8 K.

Original languageEnglish
Article number242414
JournalApplied Physics Letters
Volume103
Issue number24
DOIs
StatePublished - 9 Dec 2013

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