Properties of Permalloy Films Having a Magnetoelastic Easy Axis Normal to the Film

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  • Ernest E. Huber
    Massachusetts Institute of Technology, Lincoln Laboratory, Lexington, Massachusetts
  • Donald O. Smith
    Massachusetts Institute of Technology, Lincoln Laboratory, Lexington, Massachusetts

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<jats:p>Internal isotropic strain in Permalloy films having a negative magnetoelastic constant creates a magnetoelastic easy axis normal to the film. Below a critical thickness tc such films are single domain in the film plane and have a square B-H loop; above this thickness new configurations are established, characterized by a B-H loop of special form and having relaxation properties. Above tc the Bitter pattern is “mottled” and continues so even in the presence of a 10 000 oe field. A domain structure is proposed in qualitative agreement with experiment; mottling is interpreted in terms of centers of microstrain.</jats:p>

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