title: Quantitative evaluation of magnetic flux density in a magnetic recording head and pseudo soft underlayer by electron holography.
abstract: The magnetic interaction between the pole tip of a single-pole head and a pseudo soft underlayer in perpendicular magnetic recording was observed by electron holography. The magnetic flux density inside the soft underlayer was quantitatively evaluated. The distribution of magnetic flux density was calculated using the finite element method, and the influences of the modulation of the reference wave and stray fields were investigated by comparison with experimental results. The flux density observed was found to be underestimated due to the modulation of the phase shift in reference wave. The magnetic flux measured experimentally was larger than that inside the specimen because of the relatively large stray fields above and below the specimen in the direction of the electron beam.
authors.affiliation: Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai, Miyagi 980-8577, Japan. xiawxing@tagen.tohoku.ac.jp
authors.forename: Weixing
authors.initials: W
authors.lastname: Xia
authors.forename: Kei
authors.initials: K
authors.lastname: Hirata
authors.forename: Keiichi
authors.initials: K
authors.lastname: Yanagisawa
authors.forename: Yoichi
authors.initials: Y
authors.lastname: Ishida
authors.forename: Hiroto
authors.initials: H
authors.lastname: Kasai
authors.forename: Katsuaki
authors.initials: K
authors.lastname: Yanagiuchi
authors.forename: Daisuke
authors.initials: D
authors.lastname: Shindo
authors.forename: Akira
authors.initials: A
authors.lastname: Tonomura