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Cooperative and noncooperative magnetization reversal in alnicos

TitleCooperative and noncooperative magnetization reversal in alnicos
Publication TypeJournal Article
Year of Publication2017
AuthorsSkomski, R, Ke, LQ, Kramer, MJ, Anderson, IE, Wang, CZ, Zhang, WY, Shield, JE, Sellmyer, DJ
JournalAip Advances
Date Published05
Type of ArticleArticle; Proceedings Paper
ISBN Number2158-3226
Accession NumberWOS:000402797100222
Keywordsfuture, Materials Science, permanent-magnet, physics, Technology - Other Topics

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. (C) 2017 Author(s).

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