Disentangling the Physical Contributions to the Electrical Resistance in Magnetic Domain Walls: A Multiscale Study.

We analyze the origin of the electrical resistance arising in domain walls of perpendicularly magnetized materials by considering a superposition of anisotropic magnetoresistance and the resistance implied by the magnetization chirality. The domain wall profiles of Ll0-FePd and Ll0-FePt are determined by micromagnetic simulations based on which we perform first-principles calculations to quantify electron transport through the core and closure region of the walls. The wall resistance, being twice as high in Ll0-FePd than in Ll0-FePd, is found to be clearly dominated in both cases by a high gradient of magnetization rotation, which agrees well with experimental observations. [ABSTRACT FROM AUTHOR]