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Layered Fe-Ni(N) or Fe-Rh(N) Films for Film Heads

IP.com Disclosure Number: IPCOM000104153D
Original Publication Date: 1993-Mar-01
Included in the Prior Art Database: 2005-Mar-18
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Jones, RE: AUTHOR [+2]

Abstract

Described is a means of providing near-zero magnetostriction iron or iron-nitrogen based layered films for film heads without adversely effecting the soft magnetic properties of these films.

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Layered Fe-Ni(N) or Fe-Rh(N) Films for Film Heads

      Described is a means of providing near-zero magnetostriction
iron or iron-nitrogen based layered films for film heads without
adversely effecting the soft magnetic properties of these films.

      Iron-based layered films are advantageous for use in film heads
because their saturation inductions are approximately twice that of
conventional NiFe films.  This allows the film head to write harder
recording media, hence achieve greater recording densities.  The
problem in using these films is one of finding means to match the
other properties of NiFe, such as low coercivity and near-zero
magnetostriction.

      It is desirable to have near-zero magnetostriction in films for
film heads because otherwise the stresses in film heads can rotate
the direction of magnetic anisotropy and produce undesirable domain
configurations [1].  Unfortunately the iron films deposited in pure
argon have a high negative magnetostriction [2].  The
magnetostriction can be made near-zero by adding sufficient nitrogen
to the sputtering atmosphere, but this leads to a degradation of the
films' coercivity [2].

      Near-zero magnetostriction can be obtained with iron films
sputtered in pure argon by adding about lat% nickel or about 2at%
rhodium [3].  Amounts less than this are optimum when sputtering in
argon-nitrogen mixtures.  The saturation induction is little effected
by these additions nor do these additions render th...