Direct Observation of Local Magnetic Field Generated by Micromagnet

TL;DR

This study directly measures the local magnetic field generated by a micro-magnet using enhanced NMR techniques, providing insights that could improve MRI resolution.

Contribution

It demonstrates the direct observation of local magnetic fields from a micro-magnet using improved NMR sensitivity, which was not previously achieved.

Findings

Local magnetic field measured as +0.17 Tesla

NMR signals confirmed from Al nuclei in 20-nm layers

Results consistent with magnetic field orientation relative to external field

Abstract

Using standard nuclear magnetic resonance (NMR) technique and a well-fabricated sample, we have succeeded in directly observing local magnetic field generated by a micro-magnet Ni45Fe55 (the thickness of 400-nm) which was sputtered on an Al layer of 20-nm thickness. Improved sensitivity of our NMR technique enabled us to clearly observe Al-NMR signals, which are confirmed to come from Al nuclei in the 20-nm layers. From the analysis of the Al-NMR spectra, the local magnetic field was found to be +0.17+-0.02 (-0.20+-0.01) Tesla, the sign of which is consistent with the geometry that the external magnetic field was applied perpendicular (parallel) to the Al layer. The present study gives a potential key element toward realizing higher resolution in magnetic resonance imaging (MRI).