title: Observations of a magnetic microstructure in a Co-CoO obliquely evaporated tape using electron holography.
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.
authors.affiliation: Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan.
authors.forename: Kiwamu
authors.initials: K
authors.lastname: Tohara
authors.forename: Weixing
authors.initials: W
authors.lastname: Xia
authors.forename: Yasukazu
authors.initials: Y
authors.lastname: Murakami
authors.forename: Daisuke
authors.initials: D
authors.lastname: Shindo
authors.forename: Takuya
authors.initials: T
authors.lastname: Ito
authors.forename: Yoh
authors.initials: Y
authors.lastname: Iwasaki
authors.forename: Junichi
authors.initials: J
authors.lastname: Tachibana