Direct measurement of magnetodynamics in a perpendicular recording system

Heidmann, J.; Do, Hoa; Xiao, Min; Takano, K.; Ikeda, Yoshihiro

doi:10.1109/tmag.2005.861768

Cited by 12 publications

(3 citation statements)

References 21 publications

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“…And the magnetic interaction between the writer pole of the perpendicular recording head and the SUL can result in technical problems concerning write processes, such as adjacent track erasure (ATE) [4], [5]. The direct observation of magnetic flux density and distribution in the SUL of perpendicular magnetic recording media provides highly useful information on the precise interaction between the SUL and a writer pole in the perpendicular magnetic recording system [6]. Further, the direct analysis of the magnetic flux magnitude and distribution in a nanoscale SUL is highly recommended because of the low SUL thickness and narrow writer pole width essential to achieve higher recording density [7], [8].…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2010

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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.Index Terms-Electron holography, magnetic recording head, magnetic recording media, perpendicular magnetic recording.

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Section: Introductionmentioning

confidence: 99%

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

et al. 2010

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“…The interaction of recording head with soft underlayer (SUL) and return poles become very important in optimizing head and media at high data rates exceeding 1 Gb/s [1]- [3]. In order to calculate the dynamics of head field due to excitation by write coil field, full micromagnetic simulations are required [4]- [6].…”

Section: Introductionmentioning

confidence: 99%

Micromagnetic Study of Short and Long Yoke PMR Head With Trailing Shield

et al. 2008

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The response of a trailing shielded perpendicular magnetic recording (PMR) write head with a three-turn two-layer coils is calculated using a full micromagnetic large scale model including return pole and soft underlayer. We study the effect of PMR yoke length and write current overshoot on the dynamic response of the head at high frequency. In particular, recording performance parameter, nonlinear transition shift (NLTS) is simulated using micromagnetic media model. Shorter yoke length head improves NLTS as compared with longer yoke length. Measured NLTS has qualitative agreement with micromagnetic model results.Index Terms-Head field dynamics, nonlinear transition shift (NLTS), perpendicular magnetic recording (PMR), write head, yoke length.

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“…T HE continuing advances in magnetic recording density and data rates require an ever more detailed understanding and control of the dynamic processes in magnetic write heads, recording media, and read heads. As the typical dimensions of the write pole of single-pole-type perpendicular recording heads shrink to about 100 nm and data rates exceed 1 Gb/s, the dynamic magnetization processes in the write pole and its interaction with the soft underlayer (SUL) and the return pole become very important [1]- [3]. In turn, the reduced size of the recording head makes it possible to perform fully micromagnetic simulations [4]- [6], which can model the intrinsic magnetization dynamics and the dynamic interaction with the SUL, which has to be considered part of the head because of its mirroring effect.…”

Section: Introductionmentioning

confidence: 99%