Detection of spin waves in permalloy using planar Hall effect

TL;DR

This paper demonstrates the detection of spin waves in permalloy films through the planar Hall effect, revealing both uniform precession and parametric spin wave signals, including a novel interference-induced signal.

Contribution

It introduces a method to detect spin waves using planar Hall effect, including the observation of a new interference-based rectified signal.

Findings

Detected rectified signals from uniform magnetization precession.

Observed signals from parametric spin waves at half the pumping frequency.

Identified a novel interference-induced rectified signal.

Abstract

Rectification of microwave oscillations of magnetization in a permalloy film is realized using planar Hall effect. Two different rectified signals are obtained: a signal from the linearly excited uniform magnetization precession at the frequency of the external pumping and a signal from the pairs of contra-propagating short-wavelength spin waves parametrically generated at a half of the pumping frequency. The second, most unusual, rectified signal is caused by the uniform component of the dynamic magnetization created due to the interference of the phase correlated pairs of parametric spin waves.