Large Amplitude Spin-Hall Oscillations due to Field-like Torque

TL;DR

This paper demonstrates that large amplitude spin-Hall oscillations can be achieved and tuned from 2 GHz to 80 GHz in a ferromagnetic layer with perpendicular easy axes, driven by field-like torque without external fields.

Contribution

It introduces the analytical confirmation of oscillations driven solely by field-like torque in a specific ferromagnetic configuration, expanding understanding of spin-Hall oscillators.

Findings

Oscillation frequency tunable from 2 GHz to 80 GHz

Frequency and Q-factor enhanced by current and field-like torque

Oscillations possible without external magnetic field or polarizer

Abstract

Large amplitude spin-Hall oscillations are identified in a ferromagnetic layer with two perpendicular in-plane easy axis in the presence of field-like torque without any polarizer and external field. The analytical study confirms the possibility of oscillations in the presence of field-like torque. The investigation shows that the oscillation frequency can be tuned from 2 GHz to 80 GHz by current and enhanced by field-like torque. Further, the enhancement of frequency along with the Q-factor by current and field-like torque is also observed.