Berlin 2015 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
MA: Fachverband Magnetismus
MA 30: Magnetic Materials II
MA 30.1: Vortrag
Mittwoch, 18. März 2015, 15:00–15:15, H 0112
Pure spin thermocurrents in Permalloy at high Temperatures — •Marco Di Gennaro1, Bin Xu2, and Matthieu Verstraete1 — 1Department of Physics, University of Liege, B4000 Liege — 2Physics Department and Institute for Nanoscience and Engineering, University of Arkansas, Fayetteville, Arkansas 72701, USA
We present a method for the calculation of spin dependent transport quantities in ferromagnetic metals based on an variational resolution of the semi-classical Boltzmann equation. The electron-phonon coupling is calculated ab-initio [1], explicitly considering two different spin channels and thermal expansion. The calculated Seebeck coefficient for magnetic Permalloy agrees with experimental data measured within a large temperature range. We also calculate the spin dependent Seebeck coefficient describing a build up of spin chemical potential under application of a temperature gradient. We find that a thermal gradient can produce a pure spin current in Permalloy at high temperatures.
[1] B. Xu and M. J. Verstraete, Phys. Rev. Lett. 112, 196603 (2014).