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Browse Prior Art Database

Magnetic Keeper

IP.com Disclosure Number: IPCOM000095576D
Original Publication Date: 1964-Mar-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 23K

Publishing Venue

IBM

Related People

Louis, HP: AUTHOR

Abstract

To increase the amount of flux available for driving a thin film, open magnetic flux structure, a low reluctance path is provided by a biaxial keeper. The keeper has a linear magnetization curve, a high permeability and high frequency characteristics in all directions.

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Magnetic Keeper

To increase the amount of flux available for driving a thin film, open magnetic flux structure, a low reluctance path is provided by a biaxial keeper. The keeper has a linear magnetization curve, a high permeability and high frequency characteristics in all directions.

The biaxial keeper includes two anisotropic magnetic films 1 and 2. These are superimposed one over the other with their respective easy directions of magnetization 3 and 4 perpendicular one to the other. A layer of insulating material 5, such as silicon oxide, or a metallic medium, is interposed between films 1 and 2, to break the exchange coupling between them. Also, the thickness of films 1 and 2 is selected so that they break up into domain structures to reduce the remanent flux.

The biaxial magnetic keeper exhibits preferred magnetic properties in all directions. The keeper is superimposed over an open magnetic flux structure. Thus, closed flux paths are provided parallel to the directions of easy magnetization for each of the superimposed films.

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