Spin Hall magnetoresistance in Co₂FeSi/Pt thin films: dependence on Pt thickness and temperature

We have investigated the temperature and the Pt layer thickness dependence of the magnetoresistances (MRs) in Co₂FeSi/Pt thin films. Based on the field dependent measurements, it can be seen that the spin-current-induced spin Hall magnetoresistance (SMR) plays the dominant role in the MRs in the Co₂FeSi/Pt bilayers in the whole temperature range. Meanwhile, a quite small part of anisotropic magnetoresistance (AMR) existed in the MRs. It proved to be originated from magnetic proximity effect (MPE) by measuring the Pt thickness and temperature dependence of the AMR. Moreover, the Co₂FeSi layer thickness has much weaker effect on the SMR and AMR compared to the Pt layer thickness. These results indicate that the Co₂FeSi/Pt interface is beneficial to be used in the spin-current-induced physical phenomena.