Magnetic-field gradient in nanostructures detected by nuclear spins

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

Research output: Contribution to journalArticle

Abstract

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.

Original languageEnglish
Pages (from-to)1004-1006
Number of pages3
JournalPhysica E: Low-Dimensional Systems and Nanostructures
Volume42
Issue number4
DOIs
Publication statusPublished - 2010 Feb

Fingerprint

nuclear spin
Nanostructures
Magnetic fields
gradients
Nuclear magnetic resonance
nuclear magnetic resonance
magnetic fields
Magnetic resonance spectrometers
finite element method
spectrometers
Finite element method
nuclei
sensitivity

Keywords

  • Magnetic-field gradient
  • Nanostructure
  • Nuclear spin
  • Quantum computer

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Atomic and Molecular Physics, and Optics
  • Electronic, Optical and Magnetic Materials

Cite this

Magnetic-field gradient in nanostructures detected by nuclear spins. / Watanabe, S.; Sasaki, S.; Sato, S.; Nishimori, M.; Isogai, N.; Matsumoto, Yoshinori.

In: Physica E: Low-Dimensional Systems and Nanostructures, Vol. 42, No. 4, 02.2010, p. 1004-1006.

Research output: Contribution to journalArticle

Watanabe, S. ; Sasaki, S. ; Sato, S. ; Nishimori, M. ; Isogai, N. ; Matsumoto, Yoshinori. / Magnetic-field gradient in nanostructures detected by nuclear spins. In: Physica E: Low-Dimensional Systems and Nanostructures. 2010 ; Vol. 42, No. 4. pp. 1004-1006.
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