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Gd(x)Fe(y) and GdCoFe Materials for Magnetic Head Hall Sensors

IP.com Disclosure Number: IPCOM000085754D
Original Publication Date: 1976-May-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Gambino, RJ: AUTHOR [+3]

Abstract

The anomalous Hall effect in amorphous magnetic films has been proposed in the article appearing in the IBM Technical Disclosure Bulletin, Vol. 18, No. 12, May 1976, pages 4214 to 4217, as a method for sensing magnetic fields. In particular, it can be used in read heads for digital recording and also as a detector of magnetic bubbles.

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Gd(x)Fe(y) and GdCoFe Materials for Magnetic Head Hall Sensors

The anomalous Hall effect in amorphous magnetic films has been proposed in the article appearing in the IBM Technical Disclosure Bulletin, Vol. 18, No. 12, May 1976, pages 4214 to 4217, as a method for sensing magnetic fields. In particular, it can be used in read heads for digital recording and also as a detector of magnetic bubbles.

A Hall voltage is developed in a thin film which is transverse to the current flow when a magnetic field is applied normal to the plane of the film. When amorphous bubble-type films are used, the magnetization process is such that only a small field is necessary to cause saturation. This factor coupled with a sizable Hall voltage makes amorphous films attractive for use.

A significant increase of the anomalous Hall effect occurs in materials of the type GdCoAu or GdCoMo when Fe is substituted in part or wholly for the Co Au and Mo. For example, in the binary system Gd(3)Fe(7) the ratio Rho(H)/Rho of the Hall resistivity rho(H) to the sample resistivity rho can be 5.5% (i.e., 11% for (+) to (-) saturation). This ratio is a figure of merit in establishing the maximum signal level and power transfer in a sensing element.

In addition, the use of Fe in amorphous ternary alloys allows great flexibility in processing the material for greatest sensitivity response. A composition which has a compensation point in the magnetization curve is usually needed.

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