Domain-wall pinning at inhomogenities of arbitrary cross-sectional geometry

Ralph Skomski, Jian Zhou, Arti Kashyap, David J. Sellmyer

Research output: Contribution to journalArticle

11 Scopus citations


The coercivity of cellular Sm-Co based permanent magnets is investigated by model calculations. The grain boundaries responsible for the pinning coercivity are modeled as planar inhomogenities with arbitrary cross-sectional geometry. The calculation yields a physically transparent integral equation for the pinning energy, whose derivative is the pinning force. The theory rationalizes experimental data on a semiquantitative level, but without adjustable parameters, and bridges the gap between smooth concentration gradients and abrupt interfaces. Explicit results are obtained for sinoidal profiles, for very thin grain boundaries, and for profiles intermediate between attractive and repulsive pinning. The corrections predicted by the present model elucidate the occurrence of coercivity when the main and grain-boundary phases have the same wall energy.

Original languageEnglish (US)
Pages (from-to)2946-2948
Number of pages3
JournalIEEE Transactions on Magnetics
Issue number4 II
StatePublished - Jul 1 2004


  • Coercive force
  • Magnetic anisotropy
  • Magnetic films
  • Permanent magnets
  • Samarium alloys

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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