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
2017 AIP Advances  
It is investigated how magnetostatic interactions affect the coercivity of alnicotype 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
more » ... 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. © 2017 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license
doi:10.1063/1.4976216 fatcat:uun7a6oqkrbjbbwv3vbsg2o6zy