Spin-Orbit Torque Switching Of A High-Quality Perpendicularly Magnetized Ferrimagnetic Heusler Mn3ge Film

Current-induced spin-orbit torque (SOT) switching of magnetization has attracted great interest due to its potential application in magnetic memory devices, which offer low-energy consumption and high-speed writing. However, most of the SOT studies on perpendicularly magnetized anisotropy (PMA) magnets have been limited to heterostructures with interfacial PMA and poor thermal stability. Here, we experimentally demonstrate a SOT magnetization switching for a ferrimagnetic D0(22)-Mn3Ge film with high bulk PMA and robust thermal stability factor under a critical current density of 6.6 x 10(11) A m(-2) through the spin Hall effect of an adjacent capping Pt and a buffer Cr layer. A large effective damping-like SOT efficiency of 2.37 mT/10(10) A m(-2) is determined using harmonic measurements in the structure. The effect of the double-spin source layers and the negative-exchange interaction of the ferrimagnet may explain the large SOT efficiency and the manifested magnetization switching of Mn3Ge. Our findings demonstrate that D0(22)-Mn3Ge is a promising candidate for application in high-density SOT magnetic random-access memory devices.