Magnetic domain structure in Fe78.8-xCoxCu0.6Nb2.6Si9B9 nanocrystalline alloys studied by Lorentz microscopy

K. Saito, H. S. Park, D. Shindo, Y. Yoshizawa

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)

Abstract

The magnetic domain structures of Fe78.8-xCoxCu0.6Nb2.6Si9B9 (x=0, 20, 40, 60) alloys are investigated by Lorentz microscopy coupled with the focused ion beam method. The specimen prepared using the FIB method is found to have a considerably more uniform thickness compared to that prepared using the ion-milling method. In Fe38.8Co40Cu0.6Nb2.6Si9B9 and Fe18.8Co60Cu0.6Nb2.6Si9B9 alloys, 180° domain walls extending in the direction of the induced magnetic anisotropy are observed. Analysis with Lorentz microscopy reveals that the width of the magnetic domains decreases with an increase in the cobalt content or the induced magnetic anisotropy Ku, that is, the domain width d is proportional to the induced magnetic anisotropy (Ku)-1/4. On the other hand, in the in situ Lorentz microscopy observation as a function of temperature, magnetic ripple structures are found to appear in a localized area due to the fluctuation of magnetization vectors from 423 K. It is observed that the induced magnetic anisotropy caused by the applied magnetic field at 803 K is not suppressed by the magnetic ripple structures observed at 423-443 K.

Original languageEnglish
Pages (from-to)304-309
Number of pages6
JournalJournal of Magnetism and Magnetic Materials
Volume305
Issue number2
DOIs
Publication statusPublished - 2006 Oct

Keywords

  • Domain width
  • Focused ion beam (FIB)
  • Induced magnetic anisotropy
  • Lorentz microscopy
  • Nanocrystalline

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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