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Entropy localization in magnetic compounds and thin-film nanostructures
Ralph Skomski Publications
  • Ralph Skomski, University of Nebraska at Lincoln
  • Christian Binek, University of Nebraska-Lincoln
  • Steven A. Michalski, University of Nebraska-Lincoln
  • Tathagata Mukherjee, University of Nebraska-Lincoln
  • Axel Enders, University of Nebraska at Lincoln
  • David J. Sellmyer, University of Nebraska-Lincoln
Date of this Version

Published in JOURNAL OF APPLIED PHYSICS 107, 09A922 (2010). Copyright © 2010 American Institute of Physics. Used by permission.

The effect of nanostructuring on the magnetic entropy of materials for room-temperature magnetic cooling is investigated by model calculations. The materials are structurally inhomogeneous with a large number of nonequivalent crystallographic sites. In the mean-field Heisenberg model, the entropy density is a unique function of the local magnetization so that the coupled set of nonlinear mean-field equations yields not only the magnetization but also the entropy density. Since most of the entropy is localized near grain boundaries, nanomagnetic cooling requires small feature sizes. Magnetic anisotropy is a substantial complication, even on a mean-field level, but the corresponding corrections are often very small.
Citation Information
Ralph Skomski, Christian Binek, Steven A. Michalski, Tathagata Mukherjee, et al.. "Entropy localization in magnetic compounds and thin-film nanostructures" (2010)
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