Continuous/cluster-pinned recording media

Ralph Skomski, M. L. Yan, Y. F. Xu, David J. Sellmyer

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


We propose and theoretically investigate a new class of nanostructured magnetic recording films, cluster-pinned recording media. The films consist of magnetic clusters exchange coupled to a continuous hard layer with perpendicular anisotropy and low coercivity. Our calculations yield the coercivity and the cross-track correlation length as a function of film thickness and pinning density and strength. The mechanism is very similar to the Gaunt-Friedel pinning in bulk magnets, which differs from ordinary strong pinning by the self-consistent dependence of wall curvature and coercivity on defect concentration. The main difference is the exponent for the coercivity as a function of the pinning strength, which is equal to 2 in the bulk but equal to 3/2 in thin films. The pinning strength is estimated for various regimes, and it is shown that the diminished domain-wall curvature reduces jitter.

Original languageEnglish (US)
Pages (from-to)2163-2165
Number of pages3
JournalIEEE Transactions on Magnetics
Issue number6
StatePublished - Jun 2007


  • Coercivity
  • Domain-wall pinning
  • Magnetic recording

ASJC Scopus subject areas

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


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