Spin-orbit torque switching of ultralarge-thickness ferrimagnetic GdFeCo
AbstractWe report on spin-orbit torque measurements in ferrimagnetic Gd21(Fe90Co10)79 films with bulk perpendicular magnetic anisotropy and thicknesses up to 30nm. The dampinglike and fieldlike torques have been quantified using second harmonic Hall voltage detection. Both torques show an inverse linear dependence on the thickness that is indicative of the interfacial nature of the torques. The spin-Hall angle remains constant over the thickness range of 10 to 30nm Gd21(Fe90Co10)79. Remarkably, we find that this interfacial torque is able to switch a 30-nm-thick Gd21(Fe90Co10)79 film with a reasonably large thermal stability of ≈100kBT.