Micromagnetics and hysteresis as prototypes for complex systems
Micromagnetics and hysteresis as prototypes for complex systems
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DOI：
10.1016/s0921-4526(97)00309-8
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发表时间：
1997-06-01
影响因子：
2.8
通讯作者：
Templeton, TL
中科院分区：
文献类型：
--
作者：
Arrott, AS;Templeton, TL
在微磁学和磁滞研讨会上作了主旨发言，提到了颗粒和连续介质中的磁化模式。关于磁记录介质复杂性的细节将在另一篇论文中介绍。这里的重点是拓扑作为磁滞的来源在铁须，最明确的所有磁性材料。认为处理微磁问题的近似方法对铁晶须具有教育意义和实用价值。所讨论的构型包括畴壁与表面的相交、两个反向旋转畴壁段的相交以及后者与表面的相交。强调了连续统模型中奇点的作用。给出了简单的数学函数作为复杂的计算模型的起点，计算包括交换和各向异性能量在内的局部相互作用和包括静磁和磁弹性能量在内的远程相互作用之间的竞争。在中间步骤中，远程相互作用可以用虚构的局部能量项来近似，以减少计算六倍静磁积分的成本。
Keynote remarks are made for the workshop on micromagnetics and hysteresis, mentioning magnetization patterns in both particulate and continuous media. Details on complexity in magnetic recording media are presented in a separate paper. Here the emphasis is on topology as the source of hysteresis in iron whiskers, the most well defined of all magnetic materials. It is argued that approximate methods of treating micromagnetic problems can be educational and useful for the iron whisker. The configurations discussed include the intersection of a domain wall with a surface, the intersection of two counter rotating domain wall segments and the intersection of the latter with a surface. The role of singularities in the continuum model is emphasized. Simple mathematical functions are given as starting points for complex computational modeling of the competition between local interactions including exchange and anisotropy energies, and long-range interactions including magnetostatic and magnetoelastic energies. Long-range interactions can be approximated by fictitious local energy terms in intermediate steps designed to reduce the costs in calculating six-fold magnetostatic integrals.