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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 18.6: Talk

Monday, March 7, 2016, 16:15–16:30, H31

Comparison of laser induced and intrinsic tunnel magneto-Seebeck effect in CoFeB/MgAl2O4/CoFeB magnetic tunnel junctions — •Torsten Huebner1, Alexander Boehnke1, Ulrike Martens2, Markus Münzenberg2, Andy Thomas3, Timo Kuschel1, and Günter Reiss11CSMD, Physics Department, Bielefeld University, Germany — 2IFP, Greifswald University, Germany — 3IMW, IFW Dresden, Germany

The Seebeck coefficient of a Magnetic Tunnel Junction (MTJ) depends on its magnetic state known as the tunnel magneto-Seebeck (TMS) effect [1]. It has been extensively studied with indirect Joule and laser induced heating [2,3]. Zhang, Teixeira et al. [4,5] proposed a third method using the intrinsic Joule heating by the tunneling current without any external temperature gradient. Here, we prepared CoFeB/MgAl2O4/CoFeB MTJs and obtained a maximum tunnel magneto-resistance (TMR) ratio of 34 % at room temperature for a nominal barrier thickness of 1.8 nm. We used a modulated diode laser (Pmax=150 mW, λ=637 nm, f=177 Hz) to generate a temperature gradient across the junctions and recorded IU-characteristics to compare the laser induced TMS with the intrinsic TMS.

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