Template nanowires for spintronics applications: nanomagnet microwave resonators functioning in zero applied magnetic field

TL;DR

This paper demonstrates the fabrication and testing of zero-field nanomagnet microwave resonators using electrodeposited nanowires, enabling spintronic devices to operate without external magnetic fields.

Contribution

It introduces a novel zero-field nanomagnet microwave resonator design fabricated via electrodeposition, with detailed microwave measurement techniques and potential applications in spintronics.

Findings

Resonators operate in zero magnetic field

Device exhibits ferromagnetic resonance and spin-torque diode effect

Potential for microwave oscillators in spintronics

Abstract

Low-cost spintronic devices functioning in zero applied magnetic field are required for bringing the idea of spin-based electronics into the real-world industrial applications. Here we present first microwave measurements performed on nanomagnet devices fabricated by electrodeposition inside porous membranes. In the paper, we discuss in details a microwave resonator consisting of three nanomagnets, which functions in zero external magnetic field. By applying a microwave signal at a particular frequency, the magnetization of the middle nanomagnet experiences the ferromagnetic resonance (FMR), and the device outputs a measurable direct current (spin-torque diode effect). Alternatively, the nanodevice can be used as a microwave oscillator functioning in zero field. In order to test the resonators at microwave frequencies, we developed a simple measurement set-up.