Analyzing the influence of magnetic domain walls on longitudinal and transverse magnetoresistance in tensile strained (Ga,Mn)As

ORAL

Abstract

We present a theoretical analysis of magnetoresistance in (Ga,Mn)As epilayers with perpendicular magnetic anisotropy [Phys. Rev. B {\bf 76}, 054440 (2007)]. The model reproduces the field-antisymmetric anomalies observed in experimental measurements [Phys. Rev. B {\bf 71}, 241307(R) (2005)] of the longitudinal magnetoresistance in the planar geometry (magnetic field in the epilayer plane and parallel to the current density), as well as the unusual shape of the accompanying transverse magnetoresistance. As in the case of metallic ferromagnets with perpendicular anisotropy [Phys. Rev. Lett. {\bf 94}, 017203 (2005), the magnetoresistance characteristics are attributed to circulating currents created by the presence of magnetic domain walls.

–

Authors

  • Gang Xiang

    Dept. of Physics, Ohio State University

  • Nitin Samarth

    Dept. of Physics and Materials Research Institute, The Pennsylvania State University, Dept. of Physics, The Pennsylvania State University, Dept. of Physics, Penn State University, Physics Department, Penn State U,University Park, PA