We consider theoretically the spin blockade effect on the spin polarization of a current passing through a geometrically confined head-to-head 180∘ domain wall at a magnetic point contact in a two-dimensional (2D) metallic nanowire. The analysis is based on coherent scattering of the carriers by spin-dependent potential associated with the wall structure. The transmission properties of coherent states are obtained by introducing an algorithm to solve the coupled spin channels Schrödinger equation with mixed Dirichlet–Neumann boundary conditions applied far from the domain wall. It has been shown that a domain wall separating two media of opposite magnetization direction can act as a spin filter, allowing controllable modification of the spin polarization via the wall width.

中文翻译：

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多通道磁点接触引起的自旋极化电流

我们从理论上考虑自旋阻挡效应对通过几何限制的头对头 180 的电流的自旋极化的影响∘二维 (2D) 金属纳米线中磁点接触处的畴壁。该分析基于与壁结构相关的自旋相关电位对载流子的相干散射。通过引入一种算法来求解耦合自旋通道薛定谔方程，并在远离畴壁的地方应用混合 Dirichlet-Neumann 边界条件，从而获得相干态的传输特性。已经表明，分隔相反磁化方向的两种介质的畴壁可以充当自旋过滤器，允许通过壁宽对自旋极化进行可控修改。