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TT: Fachverband Tiefe Temperaturen

TT 58: Spincaloric Transport I (jointly with MA)

TT 58.8: Vortrag

Mittwoch, 18. März 2015, 11:15–11:30, H 0110

Anisotropic magneto-thermopower in (Ga,Mn)As thin films — •Sibylle Meyer^1,2, Matthias Althammer¹, Wladimir Schoch³, Rudolf Gross^1,2,4, and Sebastian T. B. Goennenwein^1,4 — ¹Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, Garching, Germany — ²Physik-Department, TU München, Garching, Germany — ³Institut für Quantenmaterie, Universität Ulm, Ulm, Germany — ⁴Nanosystems Initiative Munich, München, Germany

The resistance of ferromagnetic metals depends on the magnetization orientation. This is referred to as anisotropic magneto-resistance (AMR), and exploited in many applications. In close analogy, also the thermopower of magnetic metals depends on the magnetization orientation, i.e., the electrical field arising upon the application of a thermal gradient to the metal characteristically varies with the magnetization orientation (anisotropic magneto-thermopower AMTP). However, due to different symmetry restrictions, the evolution of AMR and AMTP with magnetization orientation is expected to be distinctly different. To experimentally test this conjecture, we measured the AMTP in (Ga,Mn)As single crystals. Our data show that the AMTP effect can be adequately modeled only if the symmetry of the (Ga,Mn)As crystal is explicitly taken into account. We quantitatively compare the AMTP with AMR data taken on the same (113)-oriented (Ga,Mn)As thin films and with corresponding model calculations.
Financial support by DFG via SPP 1538 is gratefully acknowledged.