Dresden 2017 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

MA: Fachverband Magnetismus

MA 64: Poster 1

MA 64.22: Poster

Freitag, 24. März 2017, 09:30–13:00, P2-EG

Temperature gradient simulations in laser-induced tunnel magneto-Seebeck experiments — •Torsten Huebner¹, Alexander Boehnke¹, Andy Thomas², Günter Reiss¹, Markus Münzenberg³, and Timo Kuschel^1,4 — ¹CSMD, Physics Department, Bielefeld University, Germany — ²IMW, IFW, Dresden, Germany — ³IFP, Greifswald University, Germany — ⁴University of Groningen, The Netherlands

The Seebeck coefficient of a magnetic tunnel junction (MTJ) changes depending on the magnetization alignment of its electrodes and, thus, the measured thermovoltage changes as well. This effect is know as the tunnel magneto-Seebeck (TMS) effect and has been studied in many systems, experimentally [1-4] as well as theoretically [5,6]. Naturally, knowledge about the temperature gradient is crucial. Since this quantity is not accessible experimentally, we use FEM simulations to draw conclusions about the heat distribution. Here, we present a detailed study of the temperature gradient depending on the barrier thickness including the uncertainty of the thermal conductivity [7].
[1] Walter et al., Nat. Mater. 10, 742 (2011)
[2] Liebing et al., Phys. Rev. Lett. 107, 177201 (2011)
[3] Boehnke et al., Rev. Sci. Instrum. 84, 063905 (2013)
[4] Huebner et al., Phys. Rev. B 93, 224433 (2016)
[5] Czerner et al., J. Appl. Phys. 111, 07C511 (2012)
[6] Heiliger et al., Phys. Rev. B 87, 224412 (2013)
[7] Zhang et al., Phys. Rev. Lett. 115, 037203 (2015)