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Title: Cooperative and noncooperative magnetization reversal in alnicos

Here, we investigate how magnetostatic interactions affect the coercivity of alnico-type magnets. Starting from exact micromagnetic relations, we also analyze two limits, namely cooperative reversal processes operative on short lengths scales and noncooperative reversal processes on long length scales. Furthermore, 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.
Authors:
 [1] ;  [2] ;  [2] ;  [2] ;  [2] ;  [1] ;  [2] ;  [1]
  1. Univ. of Nebraska, Lincoln, NE (United States). Nebraska Center for Materials and Nanoscience and Dept. of Physics and Astronomy
  2. Ames Lab. and Iowa State Univ., Ames, IA (United States)
Publication Date:
Report Number(s):
IS-J 9354
Journal ID: ISSN 2158-3226; AAIDBI
Grant/Contract Number:
AC02-07CH11358
Type:
Published Article
Journal Name:
AIP Advances
Additional Journal Information:
Journal Volume: 7; Journal Issue: 5; Journal ID: ISSN 2158-3226
Publisher:
American Institute of Physics (AIP)
Research Org:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE
OSTI Identifier:
1349347
Alternate Identifier(s):
OSTI ID: 1371885; OSTI ID: 1421275