Browse Prior Art Database

Edge Effect Magnetic Recording

IP.com Disclosure Number: IPCOM000092537D
Original Publication Date: 1966-Dec-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 57K

Publishing Venue

IBM

Related People

Dawson, JL: AUTHOR [+2]

Abstract

This is a technique for vertical magnetic recording.

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Edge Effect Magnetic Recording

This is a technique for vertical magnetic recording.

A magnetic recording medium includes nonmagnetic substrate 1, high permeability layer 2 of magnetically soft material deposited on substrate 1, and high coercivity layer 3 deposited on top of layer 2. U-shaped transducer 4 is positioned approximately parallel to the recording medium. Pole tips 5 and 6 are separated from each other by a substantial distance. The latter is large enough to prevent leakage flux from shunting across tips 5 and 6. The trailing edges of the tips 5 and 6 are maintained as sharp as possible so that transducer 4 acts as a probe for vertical recording. The clearance angle, i.e., the angle between the lower surface of 4 and the recording medium, is kept small, so that the rate of flux change is small. Thus the leading edge of the transducer tip is prevented from reading or writing data. In addition, the bearing area, i.e., the area of the lower surface of the transducer adjacent the recording medium, is kept small to concentrate the flux in the region of the recording edge of tips 5 and 6.

When a write current is applied to transducer 4, the flux passes from the trailing edge of one pole tip, through layer 3 into layer 2 and then back out through layer 3 into the other pole tip. Layer 2 thus provides a low reluctance path for the magnetic flux to complete the magnetic circuit between the tips 5 and
6. This technique allows high bit densities without the gap-w...