Coercivity of disordered nanostructures

R. Skomski, D. Leslie-Pelecky, R. D. Kirby, A. Kashyap, D. J. Sellmyer

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Abstract

Zero- and finite-temperature coercivity mechanisms in disordered nanostructures are investigated by model calculations. Three different aspects are considered. First, it is shown that strongly reduced exchange in grain-boundary regions changes the power-law scaling exponent for the coercivity of random-anisotropy magnets. Second, it is analyzed how random interatomic exchange affects the thermal blocking and therefore the coercivity of spin glasses. Third, a master-equation approach is used to quantitatively elucidate the relation between the magnetic-viscosity regime and the sweep-rate dependence of the coercivity. A common feature of the considered mechanisms is that interatomic exchange creates nanoscale cooperative units which realize the coercivity in real space.

Original languageEnglish (US)
Pages (from-to)857-862
Number of pages6
JournalScripta Materialia
Volume48
Issue number7
DOIs
StatePublished - Apr 1 2003

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Keywords

  • Coercivity
  • Free energy
  • Magnetic viscosity
  • Magnetization dynamics
  • Random anisotropy

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys

Cite this

Skomski, R., Leslie-Pelecky, D., Kirby, R. D., Kashyap, A., & Sellmyer, D. J. (2003). Coercivity of disordered nanostructures. Scripta Materialia, 48(7), 857-862. https://doi.org/10.1016/S1359-6462(02)00622-X