Berlin 2015 – scientific programme
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MA: Fachverband Magnetismus
MA 20: POSTER Ib
MA 20.22: Poster
Tuesday, March 17, 2015, 09:30–13:00, Poster A
Investigation of the tunnel magneto-Seebeck effect via I-V curve symmetries of heated and non-heated Magnetic Tunnel Junctions — •Torsten Huebner1, Alexander Boehnke1, Marvin von der Ehe2, Markus Münzenberg2, Timo Kuschel1, and Günter Reiss1 — 1CSMD, Physics Department, Bielefeld University, Germany — 2Greifswald University, Germany
The Seebeck coefficient of a Magnetic Tunnel Junction (MTJ) depends on its magnetic state known as the tunnel magneto-Seebeck effect (TMS) [1]. It has been extensively studied with indirect Joule and laser induced heating [2][3]. Zhang et al. [4] proposed a third method using the intrinsic Joule heating by the tunneling current generated by a bias voltage without any external temperature gradient. Thus, they extract the Seebeck coefficients by evaluating the symmetric contribution of the I-V curves. Here, we investigate I-V curves of CoFeB/MgO/CoFeB MTJs obtained with and without external laser heating. Thus, we are able to identify tunneling currents originating solely from the induced temperature gradient by taking the difference between the signals from the heated and non-heated MTJ. The symmetric and antisymmetric contribution of the I-V curves for various laser heating powers are discussed in detail.
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Zhang et al., Phys. Rev. Lett. 109, 037206 (2012)