Spin-orbit-torque switching on Co/Pt multilayers
Chih-Huang Lai1*, Kuo-Feng Huang1, Hsiu-Hau Lin2
1Materials Science and Engineering, National Tsing Hua University, Taiwan
2Physics, National Tsing Hua University, Taiwan
* presenting author:Chih-Huang Lai, email:chlai@mx.nthu.edu.tw
Spin-orbit-torque has drawn much attention because of its potential in spintronic applications. In this work, we focused on the spin-orbit-torque on the Co/Pt multilayers with perpendicular magnetic anisotropy for taking the advantage of its high thermal stability. We investigated the effective field and the magnetization switching induced by spin-orbit-torque in the wires of Co/Pt multilayers. The effective field enhances, and the critical critical current density for spin-orbit-torque switching reduces with increasing repeating number of the multilayers, accompanying with the rising saturation magnetization-thickness product (MS*t). Besides, we found that the reversible magnetization switching in Co/Pt multilayers would be replaced by the irreversible demagnetization when the repeating layer number of the Co/Pt multilayers excesses to a critical value, where the magnetostatic energy and Dzyaloshinskii-Moriya interaction are the driving forces. By inserting Ta dusting layer, we can hinder the demagnetization, extending the critical repeating layer number of the Co/Pt multilayers with the higher MS*t for better thermal stability, but with lower critical critical current density.


Keywords: Co/Pt multilayer, spin orbit torque