Effect of atomic anti-site disorder on the AMR in FeCo alloys

Abstract

In order to understand the anti-site disorder effect on the anisotropic magnetoresistance (AMR) effect in alloys, ${\mathrm{Fe}}_{50}\mathrm{C}{\mathrm{o}}_{50}$ alloys were studied in this work using the fully relativistic spin-polarized screened (KKR) method. The anti-site effect was modeled by interchanging Fe and Co atoms and treated by the coherent potential approximation (CPA). We find that the anti-site disorder broadens the spectral function and decreases the conductivity. Our work emphasizes that the absolute variations of resistivity under magnetic moment rotation are less affected by atomic disorders. The annealing procedure improves the AMR by reduction of the total resistivity. At the same time, we also find that the fourth-order term in the angular dependent resistivity becomes weaker when the disorder increases, resulting from increased scattering of the states around the band-crossing.

12pages, 7 figures

References in corpus (6)

• Calculating linear response functions for finite temperatures on the basis of the alloy analogy model
• Intrinsic mechanism for anisotropic magnetoresistance and experimental confirmation in Co${}_x$Fe${}_{1-x}$ single-crystal films
• Temperature dependence of the electrical resistivity and the anisotropic magnetoresistance (AMR) of electrodeposited Ni Co alloys
• Fourfold anisotropic magnetoresistance of L1${}_0$ FePt due to relaxation time anisotropy
• Theory of electronic transport in random alloys with short-range order: Korringa-Kohn-Rostoker non-local coherent potential approximation
• Green's function multiple-scattering theory with a truncated basis set: An Augmented-KKR formalism