Thermal behavior of spin-current generation in Pt_xCu_1-x devices characterized through spin-torque ferromagnetic resonance.

ABSTRACT: High temperature studies of spin Hall effect have often been neglected despite its profound significance in real-world devices. In this work, high temperature spin torque ferromagnetic resonance measurement was performed to evaluate the effects of temperature on the Gilbert damping and spin Hall efficiency of Pt_xCu_1-x. When the temperature was varied from 300?K to 407?K, the Gilbert damping was relatively stable with a change of 4% at composition x?=?66%. Alloying Pt and Cu improved the spin Hall efficiency of Pt₇₅Cu₂₅/Co/Ta by 29% to a value of 0.31?±?0.03 at 407?K. However, the critical switching current density is dependent on the ratio between the Gilbert damping and spin Hall efficiency and the smallest value was observed when x?=?47%. It was found that at this concentration, the spin transparency was at its highest at 0.85?±?0.09 hence indicating the importance of interfacial transparency for energy efficient devices at elevated temperature.

SUBMITTER: Wong GDH 

PROVIDER: S-EPMC7295739 | biostudies-literature | 2020 Jun

REPOSITORIES: biostudies-literature