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Observing the Magnetization Distribution in the Pseudo Soft Underlayer of Perpendicular Magnetic Recording Media by Electron Holography

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8 Author(s)
Hirata, K. ; Okinawa Inst. of Sci. & Technol., Kunigami, Japan ; Ishida, Y. ; Kasai, Hiroto ; Akashi, Tetsuya
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We visualized the magnetic flux density of the cross track direction in the pseudo soft underlayer (SUL) of perpendicular magnetic recording media. We deposited a pseudo-SUL on the fabricated slider of a perpendicular magnetic recording head, and used electron holography to visualize and quantify the magnetic flux magnitude and distribution in the pseudo-SUL. We observed the pseudo-SUL magnetized by the write field from the writer pole tip. The magnetic flux magnitude and full width at half maximum increased with an increasing write field. We observed a correspondence between an actual recording situation and the electron holography observation.

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Magnetics, IEEE Transactions on  (Volume:46 ,  Issue: 3 )