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Journal of Electron Microscopy Advance Access originally published online on January 19, 2009
Journal of Electron Microscopy 2009 58(1):7-13; doi:10.1093/jmicro/dfn033
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© The Author 2009. Published by Oxford University Press on behalf of Japanese Society of Microscopy. All rights reserved. For permissions, please e-mail: journals.permissions@oxfordjournals.org

Observations of a magnetic microstructure in a Co-CoO obliquely evaporated tape using electron holography

Kiwamu Tohara1, Weixing Xia1,3, Yasukazu Murakami1,*, Daisuke Shindo1, Takuya Ito2, Yoh Iwasaki2 and Junichi Tachibana2

1 Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577
2 Sony Corporation, Tagajo-Shi 985-0842, Japan

* To whom correspondence should be addressed. E-mail: murakami{at}tagen.tohoku.ac.jp

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.

Keywords     magnetic domain, magnetic recording, holography

Received      6 August 2008, accepted 22 December 2008

3 Present address: Department of Electronic Engineering, Tohoku University, Sendai 980-8579, Japan


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