Microwave field vector detector based on the nonresonant spin rectification effect

TL;DR

This paper introduces a novel microwave magnetic field vector detector utilizing nonresonant spin rectification, enabling rapid, high-resolution mapping of microwave fields for circuit optimization and fault diagnosis.

Contribution

The work presents a new method for measuring microwave magnetic field vectors based on nonresonant spin rectification, offering advantages over traditional ferromagnetic resonance techniques.

Findings

Successfully measured h-field distribution at 5.4 GHz with sub-wavelength resolution.

Demonstrated faster and more convenient field mapping compared to existing methods.

Enabled extraction of all three components of the microwave magnetic field.

Abstract

Normal microwave (MW) electromagnetic field detectors convert microwave power into voltages, which results in the loss of the vector characteristics of the microwave field. In this work, we developed a MW magnetic field (h-field) vector detector based on the nonresonant spin rectification effect. By measuring and analyzing the angle dependence of the rectification voltages under nonresonant conditions, we can extract the three components of the h-field. As an initial test of this method, we obtained the h-field distributions at 5.4 GHz generated by a coplanar waveguide with sub-wavelength resolution. Compared to methods using ferromagnetic resonance, this technique offers a faster and more convenient way to determine the spatial distribution of the h-field, which can be used for MW integrated circuit optimization and fault diagnosis.