Anisotropic interface magnetoresistance in Pt/Co/Pt sandwiches

Phys Rev Lett. 2011 May 27;106(21):217207. doi: 10.1103/PhysRevLett.106.217207. Epub 2011 May 27.


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.