Direct Observation of Local Magnetic Field Generated by Micromagnet

Details Direct Observation of Local Magnetic Field Generated by Micromagnet Direct Observation of Local Magnetic Field Generated by Micromagnet

2008-07-15

arxiv.org/abs/0807.2319v1

Appl. Phys. Lett. 92, 25316 (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

3 pages, 3 figures

Scientific paper

10.1063/1.2944144

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).

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