Local ferromagnetic resonance measurements of mesoscopically patterned ferromagnets using deterministically placed nanodiamonds

TL;DR

This paper demonstrates a precise method using nanodiamonds with nitrogen-vacancy centers to locally measure ferromagnetic resonance in mesoscopic patterned ferromagnets, revealing spatial variations in spin dynamics.

Contribution

It introduces a highly accurate placement technique for nanodiamonds as local sensors to probe ferromagnetic resonance in mesoscale structures.

Findings

Achieved sub-100 nm placement accuracy of nanodiamonds.

Detected spatial variations in ferromagnetic resonance signals.

Established a versatile approach for local spin dynamics measurements.

Abstract

Nitrogen-vacancy centers in diamond have recently been established as effective sensors of the magnetization dynamics in vicinal ferromagnetic materials. We demonstrate sub-100 nm placement accuracy of nitrogen-vacancy-containing nanodiamonds and use these as local sensors that probe optically detected ferromagnetic resonance in mesoscopically patterned Permalloy islands. These measurements reveal variations in the ferromagnetic resonance signal at different sites on these structures with distinct behavior in the edge and the bulk of patterned features. These test measurements establish an easily implemented approach for spatially targeted measurements of spin dynamics in mesoscale ferromagnets. In principle, the methodology can also be extended to local studies of nanoscale ferromagnets such as single magnetic nanowires and nanoparticles.