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Modifying the Properties of Magnetic Films

IP.com Disclosure Number: IPCOM000080581D
Original Publication Date: 1974-Jan-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Argyle, BE: AUTHOR [+6]

Abstract

In some instances, it may be desirable to modify the properties of a magnetic film after it is formed, so as to tune the properties in a particular way. Selective reaction of one of the components of the film is proposed to effect such modification. For instance, the magnetization and compensation temperature of a Gd-Co amorphous magnetic film can be changed, by the selective reaction of Gd with a gas phase such as oxygen in the air, nitrogen, water vapor, and ammonia. Additionally, selective reaction of Gd can occur with a reactive solid such as an oxide, having a lower free energy of oxidation than Gd oxide.

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Modifying the Properties of Magnetic Films

In some instances, it may be desirable to modify the properties of a magnetic film after it is formed, so as to tune the properties in a particular way. Selective reaction of one of the components of the film is proposed to effect such modification. For instance, the magnetization and compensation temperature of a Gd-Co amorphous magnetic film can be changed, by the selective reaction of Gd with a gas phase such as oxygen in the air, nitrogen, water vapor, and ammonia. Additionally, selective reaction of Gd can occur with a reactive solid such as an oxide, having a lower free energy of oxidation than Gd oxide.

As an example, an oxidation process or annealing can be used to change the compensation temperature of a Gd-Co amorphous film. The oxidation process is selective for the Gd and removes it from magnetic interaction with the cobalt sublattice, thereby effectively producing a magnetic equivalent of a more cobalt rich film.

Another technique utilizes a coating of Si0 on Gd-Co amorphous film. This amorphous magnetic material shifted about 10 Degrees C in compensation temperature, after being heated to 150 Degrees C for a one-hour period. This oxide overcoat method has the advantage of being self-limiting, if the thickness of the reactive oxide is adjusted so that the amount of oxygen available is insufficient to totally oxidize the Gd-Co film. It is especially advantageous to use a higher oxide, such as CeO(2) or SiO(2)...