Magnetic-field gradient in nanostructures detected by nuclear spins

S. Watanabe, S. Sasaki, S. Sato, M. Nishimori, N. Isogai, Y. Matsumoto

研究成果: Article査読


Based on standard nuclear magnetic resonance (NMR) technique, we have succeeded in observing local magnetic field produced by a micromagnet Ni45Fe55 (with 400 nm thickness), which was sputtered on an Al layer (with 20 nm thickness). By improving the sensitivity of our NMR spectrometer, we were able to clearly observe Al-NMR signals, which are confirmed to come from Al nuclei in the 20 nm layers. The analysis of the NMR spectra yielded the local magnetic field of +0.17 (-0.20) T, whose sign is consistent with the perpendicular (parallel) direction of the applied magnetic field to the sample. In addition, using finite element method, we have succeeded in reproducing both the value and the sign of the local magnetic field without any fitting parameters, which gave us the gradient of the local magnetic field as 0.38 Tesla/μm.

ジャーナルPhysica E: Low-Dimensional Systems and Nanostructures
出版ステータスPublished - 2010 2月

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 原子分子物理学および光学
  • 凝縮系物理学


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