Finite-temperature micromagnetism

Ralph Skomski, Pankaj Kumar, George C. Hadjipanayis, D. J. Sellmyer

Research output: Contribution to journalArticle

11 Scopus citations

Abstract

It is investigated how magnetic hysteresis is affected by finite-temperature excitations, using soft regions in hard-magnetic matrices as model systems. In lowest order, magnetization processes are described by the traditional approach of using finite-temperature materials constants such as K1(T). Nanoscale excitations are usually small perturbations. For example, a Bloch summation over all magnon wave vectors shows that remanence is slightly enhanced, because long-wavelength excitations are suppressed. However, a reverse magnetic field enhances the effect of thermal excitations and causes a small reduction of the coercivity. To describe such effects, we advocate micromagnetic calculations where finite-temperature fluctuations are treated as small corrections to the traditional approach, as contrasted to full-scale Monte Carlo simulations.

Original languageEnglish (US)
Article number6559019
Pages (from-to)3229-3232
Number of pages4
JournalIEEE Transactions on Magnetics
Volume49
Issue number7
DOIs
StatePublished - 2013

Keywords

  • Coercivity
  • finite-temperature magnetism
  • micromagnetism
  • remanence

ASJC Scopus subject areas

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

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    Skomski, R., Kumar, P., Hadjipanayis, G. C., & Sellmyer, D. J. (2013). Finite-temperature micromagnetism. IEEE Transactions on Magnetics, 49(7), 3229-3232. [6559019]. https://doi.org/10.1109/TMAG.2013.2247386