Continuous/cluster-pinned recording media

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

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

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
Volume43
Issue number6
DOIs
StatePublished - Jun 1 2007

Fingerprint

Coercive force
recording
coercivity
curvature
Magnetic recording
Domain walls
Jitter
Magnets
Film thickness
magnetic recording
Anisotropy
domain wall
film thickness
magnets
Thin films
Defects
exponents
vibration
anisotropy
defects

Keywords

  • Coercivity
  • Domain-wall pinning
  • Magnetic recording

ASJC Scopus subject areas

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

Cite this

Continuous/cluster-pinned recording media. / Skomski, Ralph; Yan, M. L.; Xu, Y. F.; Sellmyer, David J.

In: IEEE Transactions on Magnetics, Vol. 43, No. 6, 01.06.2007, p. 2163-2165.

Research output: Contribution to journalArticle

Skomski, Ralph ; Yan, M. L. ; Xu, Y. F. ; Sellmyer, David J. / Continuous/cluster-pinned recording media. In: IEEE Transactions on Magnetics. 2007 ; Vol. 43, No. 6. pp. 2163-2165.
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