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Thin Film Head for Magnetic Recording

IP.com Disclosure Number: IPCOM000036283D
Original Publication Date: 1989-Sep-01
Included in the Prior Art Database: 2005-Jan-28
Document File: 2 page(s) / 64K

Publishing Venue

IBM

Related People

Nix, JL: AUTHOR [+3]

Abstract

A thin film, magnetic recording head for very narrow magnetic track widths is described. The head is unique in that the magnetic track width is determined by the dimension of a "V"-shaped hole etched into the deposition substrate, rather than by photolithographic techniques as is conventionally done. The head also requires only a single step for deposition of both magnetic pole layers, a considerable savings where thick magnetic films are needed to achieve adequate magnetic performance.

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Thin Film Head for Magnetic Recording

A thin film, magnetic recording head for very narrow magnetic track widths is described. The head is unique in that the magnetic track width is determined by the dimension of a "V"-shaped hole etched into the deposition substrate, rather than by photolithographic techniques as is conventionally done. The head also requires only a single step for deposition of both magnetic pole layers, a considerable savings where thick magnetic films are needed to achieve adequate magnetic performance.

The recording sensor is formed on a suitable substrate such as

(Image Omitted)

single crystal sapphire into which a "V"-shaped hole has been etched (Fig. 1) using standard techniques. A layer of ferromagnetic material is deposited directly onto the walls of the "V"-shaped opening in the substrate. The next layer is a dielectric insulator which covers the previous magnetic layer and forms the magnetic gap in the center of the "V". A coil structure is deposited and patterned on the top side of the device. A planarization layer deposited over the "V" forms a smooth surface over which the final layer, the magnetic yoke of ferromagnetic material, such as NiFe, is deposited (Fig. 2). Lastly, the device is lapped and contoured from the bottom. The opening at the bottom of the "V" serves as the active magnetic gap with the magnetic track width determined solely by the long dimension of the exposed "V".

The thin film recording head described herein eli...