Thin film structures for magnetic recording heads

Details Thin film structures for magnetic recording heads Thin film structures for magnetic recording heads

1990-08-23

1992-07-21

Wolff, John H.

Dynamic magnetic information storage or retrieval

Head

Hall effect

360126, 428928, G11B 5133, G11B 533

Patent

active

051328593

ABSTRACT:
A magnetic thin film structure comprising a first layer of magnetic material having a low anisotropy H.sub.k magnetically coupled to a second layer magnetic material having a high anisotropy H.sub.k and a low coercivity. The laminate provides a dual anisotropy behavior such that the laminate exhibits a high initial permeability at relatively small applied fields during the read operation and a high anisotropy at high applied fields during the write operation. The laminate of the present invention reduces inductive head domain instability produced by the write operation while maintaining high reproducing sensitivity during the read operation. Use of the higher H.sub.k material also reduces the sensitivity of the head performance to variation in process-induced stresses.

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patent: 4610935 (1986-09-01), Kumasaka et al.
patent: 4731300 (1988-03-01), Watanabe et al.
patent: 4798765 (1989-01-01), Ishizaka et al.
IEEE Transactions on Magnetics, vol. Mag-21, No. 5: 1578-1580 (Sep. 1985) Y. Nakamura, et al. "Analysis of Domain Structure of Single Pole Perp. Head".
IEEE Transactions on Magnetics, vol. Mag-13, No. 5: 1521-1523 (Sep. 1977) J. S. Y. Feng & D. A. Thompson "Permeability of Narrow Permalloy Stripes".
IEEE Transactions on Magnetics, vol. 24, No. 3: 2045-2054 (May, 1988) J. C. Slonczewski, et al. "Micromagnetics of Laminated Permalloy Films".

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