Cooperative and noncooperative magnetization reversal in alnicos
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...
| Main Authors: | , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
AIP Publishing LLC
2017-05-01
|
| Series: | AIP Advances |
| Online Access: | http://dx.doi.org/10.1063/1.4976216 |
| _version_ | 1818612844341493760 |
|---|---|
| author | Ralph Skomski Liqin Ke Matthew J. Kramer Iver E. Anderson C. Z. Wang W. Y. Zhang Jeff E. Shield D. J. Sellmyer |
| author_facet | Ralph Skomski Liqin Ke Matthew J. Kramer Iver E. Anderson C. Z. Wang W. Y. Zhang Jeff E. Shield D. J. Sellmyer |
| author_sort | Ralph Skomski |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-12-16T15:52:41Z |
| format | Article |
| id | doaj.art-a2befd5128584d24849662de2c60bd3a |
| institution | Directory Open Access Journal |
| issn | 2158-3226 |
| language | English |
| last_indexed | 2024-12-16T15:52:41Z |
| publishDate | 2017-05-01 |
| publisher | AIP Publishing LLC |
| record_format | Article |
| series | AIP Advances |
| spelling | doaj.art-a2befd5128584d24849662de2c60bd3a2022-12-21T22:25:39ZengAIP Publishing LLCAIP Advances2158-32262017-05-0175056222056222-510.1063/1.4976216220791ADVCooperative and noncooperative magnetization reversal in alnicosRalph Skomski0Liqin Ke1Matthew J. Kramer2Iver E. Anderson3C. Z. Wang4W. Y. Zhang5Jeff E. Shield6D. J. Sellmyer7Nebraska Center for Materials and Nanoscience and Department of Physics and Astronomy, University of Nebraska, Lincoln, Nebraska 68588, USAAmes Laboratory, Iowa State University, Ames, Iowa 50011, USAAmes Laboratory, Iowa State University, Ames, Iowa 50011, USAAmes Laboratory, Iowa State University, Ames, Iowa 50011, USAAmes Laboratory, Iowa State University, Ames, Iowa 50011, USANebraska Center for Materials and Nanoscience and Department of Physics and Astronomy, University of Nebraska, Lincoln, Nebraska 68588, USAAmes Laboratory, Iowa State University, Ames, Iowa 50011, USANebraska Center for Materials and Nanoscience and Department of Physics and Astronomy, University of Nebraska, Lincoln, Nebraska 68588, USAIt 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.http://dx.doi.org/10.1063/1.4976216 |
| spellingShingle | Ralph Skomski Liqin Ke Matthew J. Kramer Iver E. Anderson C. Z. Wang W. Y. Zhang Jeff E. Shield D. J. Sellmyer Cooperative and noncooperative magnetization reversal in alnicos AIP Advances |
| title | Cooperative and noncooperative magnetization reversal in alnicos |
| title_full | Cooperative and noncooperative magnetization reversal in alnicos |
| title_fullStr | Cooperative and noncooperative magnetization reversal in alnicos |
| title_full_unstemmed | Cooperative and noncooperative magnetization reversal in alnicos |
| title_short | Cooperative and noncooperative magnetization reversal in alnicos |
| title_sort | cooperative and noncooperative magnetization reversal in alnicos |
| url | http://dx.doi.org/10.1063/1.4976216 |
| work_keys_str_mv | AT ralphskomski cooperativeandnoncooperativemagnetizationreversalinalnicos AT liqinke cooperativeandnoncooperativemagnetizationreversalinalnicos AT matthewjkramer cooperativeandnoncooperativemagnetizationreversalinalnicos AT ivereanderson cooperativeandnoncooperativemagnetizationreversalinalnicos AT czwang cooperativeandnoncooperativemagnetizationreversalinalnicos AT wyzhang cooperativeandnoncooperativemagnetizationreversalinalnicos AT jeffeshield cooperativeandnoncooperativemagnetizationreversalinalnicos AT djsellmyer cooperativeandnoncooperativemagnetizationreversalinalnicos |