Regensburg 2016 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 18: Spincaloric Transport
(Joint session of MA and TT organized by MA)

TT 18.10: Vortrag

Montag, 7. März 2016, 17:30–17:45, H31

Temperature dependence of the domain wall magneto-Seebeck effect — •Alexander Fernández Scarioni, Patryk Krzysteczko, Xiukun Hu, Niklas Liebing, Sibylle Sievers, and Hans W. Schumacher — Physikalisch-Technische Bundesanstalt, Bundesallee 100, D-38116, Braunschweig, Germany

We study the thermopower response of a magnetic domain wall in a nanowire under the influence of a thermal gradient and compare it with corresponding magnetoresistance measurements. The nanowire used is an L-shape permalloy (Ni80Fe20) nanowire. A single domain wall can be nucleated and pinned at a notch between two electrical contacts. We observe a clear thermopower signature of the domain wall pinned at the notch.

The thermal gradient is generated by an electrical microheater placed in the vicinity of the magnetic nanowire. We study the local heat distribution experimentally by microscopic resistance thermometers and numerically by finite element calculations.

By combination of thermal gradient and magnetothermopower measurements at various temperatures we can describe the system based on the anisotropic magneto-Seebeck effect.