Switching of composite media by wall propagation
Switching of composite media by wall propagation
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DOI：
10.1063/1.2177389
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发表时间：
2006-04
影响因子：
3.2
通讯作者：
Sonali Mukherjee;L. Berger
中科院分区：
文献类型：
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作者：
Sonali Mukherjee;L. Berger
使用简单的缩放参数，我们计算了复合介质中畴壁从软相传播到硬相所需的外场。在没有外部场的情况下，软相中的畴壁能量较低，导致硬相和软相之间的能垒。结果表明，随着外场的增加，在软相的畴壁能量也增加，并有一个相应的硬相的壁能量减少，导致在降低的能垒。开关场是指使两相畴壁能量相等，壁势垒为零，导致畴壁传播和反转的场。该计算允许识别场相关的各向异性和两个相的壁宽，其在反转场处变得相等。反转场线性地依赖于固有各向异性差，而与两相磁化强度之和成反比。此外，T...
Using simple scaling arguments, we calculate the external field required to propagate a domain wall from the soft to the hard phase in a composite media. In the absence of the external field the domain-wall energy is lower in the soft phase, resulting in an energy barrier between the hard and soft phases. It is shown that as the external field increases the domain-wall energy in the soft phase also increases, and there is a corresponding wall energy reduction in the hard phase, resulting in the lowering of the energy barrier. The switching field is obtained as the field, which equalizes the domain-wall energies in both phases, reduces the wall barrier to zero, and leads to wall propagation and reversal. The calculation allows identification of field dependent anisotropies and wall widths of the two phases, which become equal at the reversal field. The reversal field is found to linearly depend upon the intrinsic anisotropy difference and inversely on the sum of magnetization of the two phases. Moreover, t...