Observations of a magnetic microstructure in a co-coo obliquely evaporated tape using electron holography

Kiwamu Tohara, Weixing Xia, Yasukazu Murakami, Daisuke Shindo, Takuya Ito, Yoh Iwasaki, Junichi Tachibana

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Abstract

The magnetic microstructure in a Co-CoO obliquely evaporated tape that was subjected to a recording bit length of 250 nm was studied using electron holography. The reconstructed phase image demonstrated a periodic pattern of magnetic flux loops that were inclined to the film normal due to a well-developed columnar structure. When a magnetic field was applied to the tape for observing the remanent state by holography, the periodic pattern of the flux loops gradually disappeared. Interestingly, on applying a large magnetic field, the contour lines in the reconstructed phase image became approximately parallel to the longitudinal axis of the sliced tape, i.e. the contour lines were made to virtually deviate from the easy magnetization axis. The observations were supported by a computer simulation in which the effect of the stray magnetic field was considered.

Original languageEnglish
Pages (from-to)7-13
Number of pages7
JournalJournal of Electron Microscopy
Volume58
Issue number1
DOIs
Publication statusPublished - Jan 1 2009
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Instrumentation

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