Dynamic magnetic information storage or retrieval – Head – Core
Patent
1990-06-29
1992-10-20
Wolff, John H.
Dynamic magnetic information storage or retrieval
Head
Core
360125, G11B 5127, G11B 5147
Patent
active
051575701
ABSTRACT:
A thin film magnetic recording head for high-density recording applications. The head includes a pole formed from at least two ferromagnetic material layers with one layer having high anisotropy (H.sub.k) and low permeability (.mu.), and the other layer having low H.sub.k and high .mu.. The high H.sub.k layer provides the lower magnetic impedance flux path in the tip region and the low H.sub.k layer provides the lower magnetic impedance path in the yoke region of the head. A non-magnetic film may be disposed between the layers, with a thickness chosen to minimize domain flux coupling of the two magnetic layers, while allowing magnetic signal flux transfer between layers at an appropriate point between the tip and the yoke. The pole may be sculpted so that the low H.sub.k layer extends only partially into the tip region, or so that the high H.sub.k layer extends only partially into the yoke. Alternatively, the invention may use a laminated, high permeability layer and a homogeneous layer in place of the high H.sub.k and low H.sub.k layers.
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M. L. Mallary et al., "Frequency Response of Thin Film Heads with Longitudinal and Transverse Anisotropy", IEEE Transactions on Magnetics, vol. 26, No. 5, Sep. 1990.
M. L. Mallary et al., "Three-Dimensional Transmission Line Model for Flux Conduction in Thin-Film Recording Heads", Journal of Applied Physics, 67(9), May 1, 1990.
The Patent Office Japanese Government, Patent Abstracts of Japan, unexamined applications, E Field, vol. 8, No. 88, Apr. 21, 1984.
Batra Sharat
Mallary Michael L.
Shukovsky Harold B.
Digital Equipment Corporation
Wolff John H.
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