Magnetization reversal and giant coercivity in Sm-Co/Cu-Ti particulate films

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

Research output: Contribution to journalArticle

17 Scopus citations

Abstract

Highly coercive granular SmCo/CuTi films were produced by thermal processing of sputtered SmCos/(CuTi) multilayers and investigated experimentally and theoretically. Electron microscopy shows that the processed films consist of spherical grains that have diameters of 5-10 nm and are embedded in a matrix. Both the grains and the matrix phase exhibit the CaCu5 structure, but the matrix is probably Cu-rich. The films have high coercivities of up to 50.4 kOe at 300 K. Analytical calculations and micromagnetic simulations yield a transition from a nucleation-type weak-interaction regime to a discrete-pinning-type strong-interaction regime. The transition occurs at packing fractions similar to those encountered in the investigated films and is accompanied by a coercivity maximum.

Original languageEnglish (US)
Pages (from-to)2940-2942
Number of pages3
JournalIEEE Transactions on Magnetics
Volume40
Issue number4 II
DOIs
StatePublished - Jul 1 2004

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Keywords

  • Coercivity
  • Discrete domain-wall pinning
  • Granular films
  • Micromagnetic simulations
  • Samarium-cobalt films

ASJC Scopus subject areas

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

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