期刊
PHYSICAL REVIEW APPLIED
卷 4, 期 1, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevApplied.4.014003
关键词
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资金
- European Community [611143, 257707]
- C'Nano Ile-de-France through the project NANOMAG
- RTRA Triangle de la Physique
- Labex NanoSaclay through the project SILTENE
We present an approach to infer the surface density of magnetic moments I-s in ultrathin ferromagnetic films with perpendicular anisotropy. It relies on quantitative stray-field measurements with an atomic-size magnetometer based on the nitrogen-vacancy center in diamond. The method is applied to microstructures patterned in a 1-nm-thick film of CoFeB. We report measurements of I-s with a few percent uncertainty and a spatial resolution in the range of (100 nm)(2), an improvement by several orders of magnitude over existing methods. As an example of application, we measure the modifications of I-s induced by local irradiation with He+ ions in an ultrathin ferromagnetic wire. This method offers a route to study variations of magnetic properties at the nanoscale.
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