High power all-metal spin torque oscillator using full Heusler Co2(Fe,Mn)Si

Abstract

We showed the high rf power (Pout) emission from an all-metal spin torque oscillator (STO) with a Co2Fe0.4Mn0.6Si (CFMS)/Ag/CFMS giant magnetoresistance (GMR) stack, which was attributable to the large GMR effect thanks to the highly spin-polarized CFMS. The oscillation spectra were measured by varying the magnetic field direction, and the perpendicular magnetic field was effective to increase Pout and the Q factor. We simultaneously achieved a high output efficiency of 0.013%, a high Q of 1124, and large frequency tunability. CFMS-based all-metal STO is promising for overcoming the difficulties that conventional STOs are confronted with.