Spin structure at nanojunctions and constrictions
Spin structure at nanojunctions and constrictions
复制标题
纳米结和收缩处的自旋结构
DOI：
10.1063/1.1558666
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发表时间：
2003
期刊：
影响因子：
--
通讯作者：
D. Sellmyer
中科院分区：
文献类型：
--
作者：
R. Skomski;D. Sellmyer
一个微磁格林函数的方法是用来调查纳米结，约束，和其他障碍的自旋相关的导电的效果。根据几何形状，自旋结构的确定涉及几种类型的贝塞尔函数。绿色函数的一个共同特征是涉及主相的畴壁宽度，其可以被解释为远离结的磁化扰动的衰减长度。该长度通常为10 nm的量级，并且与扰动的强度无关。只有磁化扰动的大小取决于不均匀性的强度。所考虑的结构的一个特定特征是，总自旋相关的散射截面，从平方磁化梯度估计，表现出一个特性的真实结构相关的最大值作为边界相或结尺寸的函数。
A micromagnetic Green-function approach is used to investigate the effect of nanojunctions, constraints, and other obstacles on spin-dependent conduction. Depending on geometry, the determination of the spin structure involves several types of Bessel functions. A common feature of the Green functions is the involvement of the domain-wall width of the main phase, which can be interpreted as the decay length of the magnetization perturbation away from the junction. This length is typically on the order of 10 nm and independent of the strength of the perturbation. Only the magnitude of the magnetization perturbation depends on the strength of the inhomogenity. A particular feature of the considered structures is that the total spin-dependent scattering cross section, as estimated from the squared magnetization gradient, exhibits a characteristic real-structure dependent maximum as a function of the boundary phase or junction dimensions.