Research on sperimagnetism of GdFeCo and ferromagnetic spintronic oscillators

Abstract

We investigate the magnetoresistance of ferrimagnetic GdFeCo. It unveils that the Gd contribution to magnetoresistance is comparable to the FeCo contribution, showing that the transport of GdFeCo is antiferromagnetic. Our results therefore show that ferrimagnets are a convenient platform for studying antiferromagnetic spin transport and also are potential materials that can enable antiferromagnetic spin devices. There are many suggested ideas for the neuromorphic devices with the use of spintronic oscillators. It has been drawn attention for many years, but still it is obstructed by their low performance such as low signal quality, short-ranged frequency tunability. We propose a non-volatile 2.1GHz frequency tunability of a spin Hall nano-oscillator by applying the gate voltage on it. From the results, we hope it brings a new prospect on the use of spin Hall nano-oscillator based neuromorphic devices. We study the micromagnetic system of domain wall oscillator and z-spin polarized spin torque oscillator to find a way to enhance the signal amplitude of spintronic oscillators. With these two outstanding magnetic oscillators, we expect that it could provide a new approach for the magnonic devices and bring a development of energy efficient powerful spintronic oscillators.