Magnon scattering in the transport coefficients of CoFe thin films

Abstract

Resistivity ρ, thermopower S, and thermal conductivity κ were measured simultaneously on a set of CoFe alloy films. Variation of the Co-content xCo allows for a systematic tuning of the Fermi level through the band structure, and the study of the interplay between electronic and magnetic contributions to the transport coefficients. While band structure and magnon effects in ρ and κ are rather weak, they turn out to be very significant in S. The evolution of Mott and magnon drag contributions to S is traced between the two limiting cases of pure Fe and pure Co. In addition, we find an interesting sign change of the magnon drag.

Effect of atomic anti-site disorder on the anisotropic magnetoresistance in Fe50Co50 alloys

“…The comparison of the five Fe x (Co) 1−x Co x (Fe) 1−x alloys in figures 2(c) and (d) can lead to the conclusion that anti-site disorder causes enhanced scattering and a substantial increase in resistivity. Srichandan et al [33] obtained the calculated ρ of 2.70 µΩcm. According to the experiments of Freitas and Berger [34], the FeCo resistivity increased from 2.09 µΩcm to 3.24 µΩcm with the increasing disorder by varying the quenching temperatures, which clearly connected the atomic disorder effect on the electronic transport.…”