Spin Hall magnetoresistance in metallic bilayers

Abstract

Spin Hall magnetoresistance (SMR) is studied in metallic bilayers that consist of heavy metal (HM) layer and a ferromagnetic metal (FM) layer. We find nearly a ten-fold increase of SMR in W/CoFeB compared to previously studied HM/ferromagnetic insulator (FI) systems. The SMR increases with decreasing temperature despite the negligible change in the W layer resistivity with temperature. A model is developed to account for the absorption of the longitudinal spin current to the FM layer, one of the key characteristics of a metallic ferromagnet. We find that the model not only quantitatively describes the HM layer thickness dependence of SMR, allowing accurate estimation of the spin Hall angle and the spin diffusion length of the HM layer, but also can account for the temperature dependence of SMR by assuming a temperature dependent spin polarization of the FM layer. These results illustrate the unique role a metallic ferromagnetic layer plays in defining spin transmission across the HM/FM interface.

References in corpus (6)

• Theory of spin Hall magnetoresistance
• Role of transparency of platinum-ferromagnet interface in determining intrinsic magnitude of spin Hall effect
• Unidirectional spin Hall magnetoresistance in ferromagnet/normal metal bilayers
• Scaling behavior of the spin pumping effect in ferromagnet/platinum bilayers
• Magnetoresistance due to edge spin accumulation
• Intrinsic magnetoresistance in metal films on ferromagnetic insulators

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