Direct current voltage induced by microwave signal in a ferromagnetic wire

TL;DR

This paper investigates how microwave signals induce a direct current voltage in a ferromagnetic wire through spin transfer torque and resonant spin wave excitation, supported by experimental and micromagnetic simulation results.

Contribution

It demonstrates the rectification mechanism in ferromagnetic wires driven by RF currents, highlighting the role of spin transfer torque and spin wave resonance, which is a novel insight.

Findings

RF current induces a measurable DC voltage in ferromagnetic wire

Rectification is linked to resonant spin wave excitation

Micromagnetic simulations confirm spin wave generation by RF current

Abstract

Experimental results of rectification of a constant wave radio frequency (RF) current flowing in a single-layered ferromagnetic wire are presented. We show that a detailed external magnetic field dependence of the RF current induced a direct-current voltage spectrum. The mechanism of the rectification is discussed in a term of the spin transfer torque, and the rectification is closely related to resonant spin wave excitation with the assistant of the spin-polarized RF current. The micromagnetic simulation taking into account the spin transfer torque provides strong evidence which supports the generation of spin wave excitation by the RF current.