Coercivity of a percolative magnetic system

José Mejía-López, José Mejía-López, Ricardo Ramírez, Miguel Kiwi, Michael J. Pechan, J. Zachary Hilt, S. Kim, Harry Suhl, Ivan K. Schuller

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


A model that describes the behavior of the coercivity Hc, 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 Hc as a function of external magnetic field orientation. For a [111] oriented fcc film, if p is less than the percolation threshold Pcr, a sixfold symmetry is observed. However, if p ≈ Pcr the percolation is isotropic.

Original languageEnglish
Article number060401
Pages (from-to)604011-604014
Number of pages4
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number6
StatePublished - 2001

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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