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Films with Shifted B H Loops

IP.com Disclosure Number: IPCOM000093871D
Original Publication Date: 1966-Mar-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 20K

Publishing Venue

IBM

Related People

Greiner, JH: AUTHOR

Abstract

This method provides iron films with shifted B-H loops.

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Films with Shifted B H Loops

This method provides iron films with shifted B-H loops.

Magnetic films with shifted B-H loops are useful in magnetic devices. Iron films are reacted with a H(2) and H(2)S gas mixture to obtain shifted B-H loops. For example, a 1000 angstroms thick iron film is reduced in H(2) for one hour at 300 degrees C. and then subjected in a H(2)S/ H(2) mol gas ratio of about 10/-5/ for one hour at 300 degrees C. As shown, the B-H loop along the easy direction shifts.

The amount of B-H loop shift is varied by controlling the temperature, time and H(2)S/H(2) gas ratio during sulfiding. The direction of the loop can be associated with an exchange coupling between ferromagnetic iron and antiferromagnetic ferrous sulfide. Alloy films, containing iron such as nickel-iron and cobalt-iron films, exhibit similar properties after sulfiding.

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