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MA: Fachverband Magnetismus

MA 9: Spincaloric Transport (jointly with TT)

MA 9.10: Talk

Monday, March 7, 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.