On The Role Of The Dipolar Coupling On The Magnetization Reversal Process In Hard-soft Nanocomposite Magnets
On The Role Of The Dipolar Coupling On The Magnetization Reversal Process In Hard-soft Nanocomposite Magnets
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DOI：
10.1109/20.619606
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发表时间：
1997-04
期刊：
影响因子：
--
通讯作者：
M. Emura;F. Missell
中科院分区：
文献类型：
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作者：
M. Emura;F. Missell
我们提出了简单的纳米复合硬-软磁体的磁滞曲线的模拟。研究了具有不同磁化强度与各向异性比m=/spl μ//sub 0/M/sub s//sup 2//2K的硬-软-硬三组晶粒的磁化率。该系统被描述的微磁模型考虑到各向异性，塞曼，交换和偶极能量和它们的动力学其次是由Monte Carlo大都会算法。假设交换与各向异性比a=Ad/sup-2//K足够大以提供良好的晶粒间耦合。然后，对于硬晶粒中的小m值，反转过程通过Neel状壁传播到这些晶粒中，而对于m>0.25，观察到布洛赫状壁。
We present simulations of hysteresis curves of simple nanocomposite hard-soft magnets. The coercivity was investigated for triads of hard-soft-hard grains having different magnetization-to-anisotropy ratios m=/spl mu//sub 0/M/sub s//sup 2//2K. The systems were described by a micromagnetic model taking into account anisotropy, Zeeman, exchange and dipolar energies and their dynamics were followed by a Monte Carlo Metropolis algorithm. The exchange-to-anisotropy ratio a=Ad/sup -2//K was assumed large enough to provide good intergrain coupling. Then, for small m values in the hard grain, the propagation of the reversal process into those grains occurred through a Neel-like wall, whereas, for m>0.25, a Bloch-like wall was observed.