Disorder and coercivity in magnetic particle systems
Computer simulation has been utilized to understand the hysteretic behavior of magnetic particle systems. Particles are assumed to be single domain, spherical in shape, and possess no intrinsic anisotropy. Neighboring spins are not exchange-coupled. Particles are either randomly packed or displaced...
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| Format: | Journal Article |
| Language: | English |
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2011
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| Online Access: | https://hdl.handle.net/10356/91939 http://hdl.handle.net/10220/6776 |
| _version_ | 1826126149736988672 |
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| author | Zhao, Yang Bertram, H. Neal |
| author2 | School of Materials Science & Engineering |
| author_facet | School of Materials Science & Engineering Zhao, Yang Bertram, H. Neal |
| author_sort | Zhao, Yang |
| collection | NTU |
| description | Computer simulation has been utilized to understand the hysteretic behavior of magnetic particle systems. Particles are assumed to be single domain, spherical in shape, and possess no intrinsic anisotropy. Neighboring spins are not exchange-coupled. Particles are either randomly packed or displaced from cubic lattice positions in random directions. The gyromagnetic equation of motion with Landau-Lifshitz damping is solved for each spin during a dynamic process. Regular spin arrangements yield no hysteresis or coercivity. For spin configurations randomly displaced from a cubic lattice, hysteretic behavior is observed. Coercivity increases with randomness of particle position. Detailed examination of the magnetization reversals reveals chain formations and transient vortex states in randomly packed arrays. Coercivity versus packing fraction inferred for finite sized particles shows a maximum. |
| first_indexed | 2024-10-01T06:48:00Z |
| format | Journal Article |
| id | ntu-10356/91939 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T06:48:00Z |
| publishDate | 2011 |
| record_format | dspace |
| spelling | ntu-10356/919392023-07-14T15:52:30Z Disorder and coercivity in magnetic particle systems Zhao, Yang Bertram, H. Neal School of Materials Science & Engineering DRNTU::Engineering::Materials::Magnetic materials Computer simulation has been utilized to understand the hysteretic behavior of magnetic particle systems. Particles are assumed to be single domain, spherical in shape, and possess no intrinsic anisotropy. Neighboring spins are not exchange-coupled. Particles are either randomly packed or displaced from cubic lattice positions in random directions. The gyromagnetic equation of motion with Landau-Lifshitz damping is solved for each spin during a dynamic process. Regular spin arrangements yield no hysteresis or coercivity. For spin configurations randomly displaced from a cubic lattice, hysteretic behavior is observed. Coercivity increases with randomness of particle position. Detailed examination of the magnetization reversals reveals chain formations and transient vortex states in randomly packed arrays. Coercivity versus packing fraction inferred for finite sized particles shows a maximum. Accepted version 2011-05-09T04:28:59Z 2019-12-06T18:14:32Z 2011-05-09T04:28:59Z 2019-12-06T18:14:32Z 1992 1992 Journal Article Zhao, Y., & Bertram, H. N. (1992). Disorder and coercivity in magnetic particle systems. Journal of Magnetism and Magnetic Materials, 114(3), 329-335. https://hdl.handle.net/10356/91939 http://hdl.handle.net/10220/6776 10.1016/0304-8853(92)90275-S en Journal of magnetism and magnetic materials ©1992 Elsevier This is the author created version of a work that has been peer reviewed and accepted for publication by Journal of Magnetism and Magnetic Materials, Elsevier. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [DOI: http://dx.doi.org/10.1016/0304-8853(92)90275-S]. 15 p. application/pdf |
| spellingShingle | DRNTU::Engineering::Materials::Magnetic materials Zhao, Yang Bertram, H. Neal Disorder and coercivity in magnetic particle systems |
| title | Disorder and coercivity in magnetic particle systems |
| title_full | Disorder and coercivity in magnetic particle systems |
| title_fullStr | Disorder and coercivity in magnetic particle systems |
| title_full_unstemmed | Disorder and coercivity in magnetic particle systems |
| title_short | Disorder and coercivity in magnetic particle systems |
| title_sort | disorder and coercivity in magnetic particle systems |
| topic | DRNTU::Engineering::Materials::Magnetic materials |
| url | https://hdl.handle.net/10356/91939 http://hdl.handle.net/10220/6776 |
| work_keys_str_mv | AT zhaoyang disorderandcoercivityinmagneticparticlesystems AT bertramhneal disorderandcoercivityinmagneticparticlesystems |