Cooperative and noncooperative magnetization reversal in alnicos

Ralph Skomski, Liqin Ke, Matthew J. Kramer, Iver E. Anderson, C. Z. Wang, W. Y. Zhang, Jeff E. Shield, D. J. Sellmyer

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Abstract

It is investigated how magnetostatic interactions affect the coercivity of alnico-type magnets. Starting from exact micromagnetic relations, we analyze two limits, namely cooperative reversal processes operative on short lengths scales and noncooperative reversal processes on long length scales. In alnicos, intrawire interactions are predominantly cooperative, whereas interwire effects are typically noncooperative. However, the transition between the regimes depends on feature size and hysteresis-loop shape, and interwire cooperative effects are largest for nearly rectangular loops. Our analysis revises the common shape-anisotropy interpretation of alnicos.

Original languageEnglish (US)
Article number056222
JournalAIP Advances
Volume7
Issue number5
DOIs
Publication statusPublished - May 1 2017

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Skomski, R., Ke, L., Kramer, M. J., Anderson, I. E., Wang, C. Z., Zhang, W. Y., ... Sellmyer, D. J. (2017). Cooperative and noncooperative magnetization reversal in alnicos. AIP Advances, 7(5), [056222]. https://doi.org/10.1063/1.4976216