Comparative analysis of spin wave imaging using nitrogen vacancy centers and time resolved magneto-optical measurements

TL;DR

This paper compares NV center-based spin wave imaging with traditional magneto-optical methods, demonstrating enhanced contrast and discussing the advantages and limitations of NV centers for spin wave visualization.

Contribution

It introduces a novel NV center-based method for imaging spin waves and compares its performance to established magneto-optical techniques.

Findings

Enhanced contrast in spin wave imaging using NV centers

Successful extraction of spin wave dispersion with NV sensors

Discussion of advantages and limitations of NV-based measurements

Abstract

Spin waves, the fundamental excitations in magnetic materials, are promising candidates for realizing low-dissipation information processing in spintronics. The ability to visualize and manipulate coherent spin-wave transport is crucial for the development of spin wave-based devices. We use a recently discovered method utilizing nitrogen vacancy (NV) centers, point defects in the diamond lattice, to measure spin waves in thin film magnetic insulators by detecting their magnetic stray field. We experimentally demonstrate enhanced contrast in the detected wavefront amplitudes by imaging spin waves underneath a reference stripline and phenomenologically model the results. By extracting the spin wave dispersion and comparing NV center based spin wave measurements to spin wave imaging conducted through the well-established time-resolved magneto-optical Kerr effect, we discuss the advantages and limitations of employing NV centers as spin wave sensors.