Dresden 2017 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 63: Spincaloric Transport (joint session MA, TT, organized by MA)

TT 63.3: Talk

Thursday, March 23, 2017, 10:00–10:15, HSZ 403

Magneto-Seebeck Tunneling Across a Vacuum Barrier — •Cody Friesen, Hermann Osterhage, and Stefan Krause — Department of Physics, University of Hamburg, Jungiusstr. 11A, 20355 Hamburg, Germany

The tunneling magneto-Seebeck effect has been intensively studied both for its potential applications in e.g. waste heat recycling in electronics, and for the insights it can provide into fundamental solid state phenomena [1]. Previously, spin-resolved measurements have been performed using planar magnetic tunneling junctions [2], which limits the achievable spatial resolution.

We have investigated (magneto-)Seebeck tunneling across a vacuum barrier using spin-polarized scanning tunneling microscopy (SP-STM) [4], at low temperatures (T = 50 K) and UHV conditions. A 15 mW fiber-coupled diode laser was used to heat only the magnetic STM tip, creating a controllable temperature differential across the junction. With this approach the contribution of different surfaces to magneto-Seebeck tunneling has been probed on the Fe/W(110) monolayer system. The first laterally resolved experimental results will be shown and discussed in terms of tunneling thermovoltage and associated magneto-Seebeck coefficients.

[1] G. Bauer et al., Nat. Mater. 11, 5 (2012).

[2] M. Walter et al., Nat Mater 10, 10 (2011).

[3] R. Wiesendanger, Rev. Mod. Phys. 81, 4 (2009).