Berlin 2015 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 58: Spincaloric Transport I (jointly with MA)

TT 58.7: Vortrag

Mittwoch, 18. März 2015, 11:00–11:15, H 0110

Anisotropic magnetothermopower in Co-based trilayers: A comparison between Cu, Pd, and Pt as heterostructure partners — •Voicu Popescu and Peter Kratzer — Faculty of Physics and CENIDE, University Duisburg-Essen, 47057 Duisburg, Germany

Within the framework of the spin-polarized relativistic Korringa-Kohn-Rostoker Green’s function method we investigate the magnetothermopower (MTP) in a series of M/Co/M (M= Cu, Pd, and Pt) trilayer systems. As thermoelectric analogue of the conventional anisotropic magnetoresistance (AMR), the amplitude of the MTP signal is shown to depend on the asymmetry of the AMR around the Fermi energy. This asymmetry is sizable even if the magnetic layer itself displays only a small AMR, thus providing a path towards an efficient spin read-out thermoelectric device based on a single ferromagnetic layer. Our calculations establish a direct correlation between the strength of the spin-orbit coupling, modulated by the heterostructure partner M, and the MTP. The role of Co/M interface related effects such as structural relaxation and interdiffusion is also discussed.