A radio frequency/direct current hybrid rotatable spin torque ferromagnetic resonance platform.

Abstract

We present a hybrid rotational spin torque ferromagnetic resonance (ST-FMR) platform that integrates radio frequency (RF) and direct current (DC). By combining the conductive slip ring technology with a conventional ST-FMR system, 360° rotations can be achieved while applying DC up to 600 V/10 A and RF sources up to 40 GHz. The system demonstrates angular stability with less than 1% variation in DC resistance and less than 2% variation in S-parameters. Furthermore, based on the hybrid platform, heating and temperature measurements were achieved through the DC ports, and the temperature dependence of the spin Hall efficiency in the range of 20-70 °C was obtained. The demonstration of this platform provides a valuable and scalable tool for advancing research on spin dependent transport and regulation, as well as for the development of next-generation spintronic devices.