Regensburg 2016 – scientific programme

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TT: Fachverband Tiefe Temperaturen

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

TT 18.5: Talk

Monday, March 7, 2016, 16:00–16:15, H31

Current progress of the tunnel magneto-Seebeck effect in Heusler based MTJs — •Alexander Boehnke¹, Torsten Huebner¹, Ulrike Martens², Marvin von der Ehe², Christian Sterwerf¹, Christian Franz³, Timo Kuschel¹, Andy Thomas^1,4, Christian Heiliger³, Markus Münzenberg², and Günter Reiss¹ — ¹CSMD, Physics Department, Bielefeld University, Germany — ²University of Greifswald, Germany — ³University of Giessen, Germany — ⁴IMW, IFW Dresden, Germany

The tunnel magneto-Seebeck effect (TMS) [1,2] describes the difference of the Seebeck coefficients S_p and S_ap of a magnetic tunnel junction (MTJ) in the parallel and antiparallel magnetization alignment. Obviously, increasing the difference between S_p and S_ap as well as their magnitude is desirable to reduce the signal-to-noise ratio, e.g. for determining the magnetic state of the MTJ in memory applications.

Here, we suggest MTJs with an MgO barrier and Heusler compound electrodes (e.g. Co₂FeAl, Co₂FeSi) as good candidates for fulfilling both goals, because of their half-metallic density of states [3]. We will present current results on TMS measurements performed on these MTJs and discuss how to optimize the choice of materials for future devices.

[1] Walter et al., Nature Mater. 10, 742 (2011).

[2] Boehnke et al. Rev. Sci. Instrum. 84, 063905 (2013).

[3] Geisler et al., Phys. Rev. B. 92, 144418 (2015).