Dresden 2017 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 63: Spincaloric Transport (joint session MA, TT, organized by MA)
TT 63.1: Talk
Thursday, March 23, 2017, 09:30–09:45, HSZ 403
Tunnel magneto-Seebeck effect in MgAl2O4 based magnetic tunnel junctions — •Torsten Huebner1, Alexander Boehnke1, Ulrike Martens2, Andy Thomas3, Günter Reiss1, Markus Münzenberg2, and Timo Kuschel1,4 — 1CSMD, Physics Department, Bielefeld University, Germany — 2IFP, Greifswald University, Germany — 3IMW, IFW Dresden, Germany — 4University of Groningen, The Netherlands
The tunnel magneto-Seebeck (TMS) effect describes the changing Seebeck coefficient of a magnetic tunnel junction (MTJ) depending on the relative magnetization alignment of its ferromagnetic electrodes. This effect has been measured in several material systems and with different experimental methods [1-4]. In our study, we focus on MTJs with MgAl2O4 (MAO) barrier, because of its theoretical advantages in comparison to MgO [5,6]. We find a distinct maximum of the TMS effect at a nominal barrier thickness of 2.6 nm, almost doubling the effect ratio measured at standard barrier thicknesses of (1.8-2.0) nm.
[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] Zhang et al., Appl. Phys. Lett. 100, 222401 (2012)
[6] Miura et al., Phys. Rev. B 86, 024426 (2012)