투고논문

Abstract Spin orbit torque would be applied as the next generation of MRAM, so many researchers are interested in related field. To make a more efficient device, electric current should convert into spin current with high efficiency. Moreover, it becomes important to measure efficiency of spin orbit torque accurately. We measured spin torque FMR of W/CoFeB hetero structure system with direct current. The efficiencies of the damping like torque and field like torque were measured by using the linewidth and on-resonance field proportional to direct current. In addition, we analyzed that a quadratic shift of the on-response field was caused by the Joule heating.

Keywords FMR, spin torque ferromagnetic resonance, spin orbit torque, spin Hall effect, Rashba effect, damping like torque, field like torque 

 

* Address correspondence to: Changsoo Kim, Spin Convergence Research Team, Korea Research Institute of Standards and Science, Daejeon 34113, Republic of Korea, Tel: 82-42-868-5476; E-mail: cskim00@gmail.com