Coercivity of a percolative magnetic system

Abstract:

A model that describes the behavior of the coercivity H<inf>c</inf>, of coalescing Ni films, as a percolation phenomenon is presented. We show that there is a nonmonotonic dependence, of the coercive field as a function of the occupation probability p. This behavior is a function of cluster size and topology, and is independent of the growth direction of the thin film. Based on these ideas we predict theoretically, and confirm experimentally, the dependence of H<inf>c</inf> as a function of external magnetic field orientation. For a [111] oriented fcc film, if p is less than the percolation threshold P<inf>cr</inf>, a sixfold symmetry is observed. However, if p ≈ P<inf>cr</inf> the percolation is isotropic.

Año de publicación:

2001

Keywords:

Fuente:

scopus