Magnetic fingerprint in a ferromagnetic wire: Spin torque diode effect and induction of the DC voltage spectrum inherent in the wire under application for RF current

TL;DR

This paper demonstrates how a magnetic domain wall in a ferromagnetic wire can rectify RF currents into a DC voltage through the spin torque diode effect, with the voltage spectrum revealing the wire's internal spin structure.

Contribution

It introduces the magnetic fingerprint concept by linking the DC voltage spectrum to the internal spin structure of the domain wall in a ferromagnetic wire.

Findings

DC voltage generated by RF current depends on domain wall structure

The voltage spectrum acts as a magnetic fingerprint of the spin structure

Resonant spin wave excitation causes magnetoresistance oscillation

Abstract

We report the rectifying effect of a constant-wave radio frequency (RF) current by a magnetic domain wall (DW) on a single-layered ferromagnetic wire. A direct-current (DC) voltage is generated by the spin torque diode effect, which is a consequence of magnetoresistance oscillation due to the resonant spin wave excitation induced by the spin-polarized RF current. The DC voltage spectrum strongly depends on the internal spin structure in the DW, which corresponds to the magnetic fingerprint of the spin structure in the ferromagnetic wire.