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Improved Exchange Coupling Between Femn And Permalloy Using An Epitaxial Lattice Matched Sublayer Film

IP.com Disclosure Number: IPCOM000041086D
Original Publication Date: 1987-Jul-01
Included in the Prior Art Database: 2005-Feb-02
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Howard, JK: AUTHOR [+2]

Abstract

A thin film magnetic structure is described in which improved exchange coupling is provided between FeMn and NiFe by the use of an epitaxial lattice matched sublayer film.

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Improved Exchange Coupling Between Femn And Permalloy Using An Epitaxial Lattice Matched Sublayer Film

A thin film magnetic structure is described in which improved exchange coupling is provided between FeMn and NiFe by the use of an epitaxial lattice matched sublayer film.

The thin film structure is deposited on a substrate, and the first layer comprises a nucleation layer in the form of an epitaxial film to stabilize the FCC FeMn for exchange coupling to NiFe. In general, the nucleation layers are metallic with cell constants that can be varied by changing composition, with the intent of matching the cell constant of the nucleation layer to the second layer in the structure which is preferably the (FCC) phase of FeMn. The NiFe is deposited as the third layer in the structure.

In a specific embodiment, the nucleation layer was a binary alloy, NiCr, that reduced the lattice misfit to a low level. In a second embodiment the use of a ternary alloy, such as NiCrPt or NiCrPd, permitted the lattice misfit to be tuned to zero depending on the specific composition of the nucleation sublayer and its thickness.

Disclosed anonymously.

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