Institut für Angewandte Physik, Universität Hamburg, Jungiusstrasse 11, 20355 Hamburg, Germany.
Phys Rev Lett. 2011 May 27;106(21):217207. doi: 10.1103/PhysRevLett.106.217207.
We report on an effect of reduced dimensionality on the magnetotransport in cobalt layers sandwiched by platinum. In a current in-plane geometry it is found that the resistivity depends on the magnetization orientation within the plane perpendicular to the current direction. The resistivity shows a symmetry adapted cos(2) dependence on the angle to the surface normal, with the maximum along the surface normal. The Co thickness dependence of the effect in Pt/Co/Pt sandwiches clearly points out that the mechanism behind this effect originates at the Co/Pt interfaces and is disparate to the texture induced geometrical size effect.
我们报告了在由铂夹着的钴层中维度降低对磁输运的影响。在面内电流几何结构中，我们发现电阻率取决于与电流方向垂直的平面内的磁化方向。电阻率与表面法线的夹角呈现出对称适应的 cos(2) 依赖关系，最大值沿着表面法线方向。Pt/Co/Pt 三明治中 Co 厚度对该效应的依赖性清楚地表明，该效应背后的机制源自 Co/Pt 界面，与织构诱导的几何尺寸效应不同。
