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LIHai-Jin TAORul-Bao 《理论物理通讯》2002,37(5):627-630
Based on a classical Heisenberg lattice model with dipole interaction and the method of spin dynamic simulation,the magnetic configurations (MC),hysteresis loop (HL) and magnetic resistance (MR) of the nanomagnets with different geometries,such as circle,square and rectangle,are studied for different directions of applied field.In the case of perpendicular field to the plane,the magnetization and MR are reversible and have not hysteresis.When the field is applied in the plane,the HL is irreversible and is qualitatively well agreeable with the current experimental results.The MR loop is also irreversible and appears two peaks distributed at two sides around zero field.The peaks of magnetic resistance are relative to the vortex state of similar configuration.Large easy-axis anisotropy will suppress the MC anisotropy,and the large magnetoresistance effect disappears. 相似文献
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电力系统奇阶次谐波分叉的数值模拟 总被引:1,自引:0,他引:1
本文用Runge-Kutta方法与Galerkin方法揭示了电力系统中一些鲜为人知的物理理过程。例如低频谐振与磁滞回环的变异之间的联系;次谐波分叉的两极分化;分频谐振与基频谐振共存的频率范围等等。 相似文献
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改进了JA-SW混合模型, 使之能处理具有两种单轴各向异性的磁体. 数值研究了面内应力对铁磁薄膜磁滞损耗和矫顽力的影响. 结果表明, 磁滞损耗和矫顽力与应力强度和应力施加方向以及外场取向有关. 磁滞损耗或矫顽力随应力强度变化的关系曲线并不完全是单调增加的, 比如当外场与易轴方向平行时会出现弯曲. 另外, 应力会造成矫顽力随外场取向角关系曲线的峰值偏移. 结果与文献资料进行了广泛对比并对其差异进行了解释.
关键词:
JA-SW混合模型
磁滞损耗
矫顽力
应力 相似文献