Crack resistant magnetic write head

Details Crack resistant magnetic write head Crack resistant magnetic write head

1996-10-21

1999-03-09

Levy, Stuart S.

Dynamic magnetic information storage or retrieval

Head

Core

360119, 360113, G11B 5147, G11B 523

Patent

active

058809155

ABSTRACT:
The reconfiguration of a magnetic write head minimizes cracking at the ABS. This is accomplished by selectively reconfiguring the front edge of the insulation layer that defines the zero throat height (ZTH) so as to increase the volume of the overcoat layer which interfaces with the reconfigured edge. The front edge of the ZTH-defining insulation layer has a central portion which is centered with respect to the second pole tip and first and second lateral portions which are on each side of the front portion and parallel to the ABS. The front edge portion is recessed from the ABS a distance appropriate for defining the ZTH between the first and second pole pieces of the write head. The first and second lateral edges are further recessed into the head so as to increase the volume of the overcoat layer between the ABS and the first and second lateral edges. The increased volume of the overcoat layer better absorbs stresses and strains due to shock loading and temperature so as to reduce cracking of the head at the ABS.

REFERENCES:
patent: 5198949 (1993-03-01), Narisawa et al.
patent: 5559654 (1996-09-01), Das
patent: 5621596 (1997-04-01), Santini
patent: 5706152 (1998-01-01), Hanjo et al.
A. S. Chekanove et al., "Microcracks of the Alumina of the Thin-Film Head: Study and Simulation", IEEE Transactions on Magnetics, vol. 31, No. 6, Nov. 1995, pp. 2991-2993.
J. M. Harker et al. "A Quarter Century of Disk File Innovation", IBM J. Res. Develop., vol. 25, No. 5, Sep. 1981, pp. 677-689.

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