Berlin 2018 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 21: Poster I

MA 21.53: Poster

Dienstag, 13. März 2018, 09:30–13:00, Poster A

Ab initio calculations of magneto crystalline anisotropy in magnetic tunnel junctions — •Philipp Risius, Carsten Mahr, Michael Czerner, and Christian Heiliger — Institut für Theoretische Physik, Universität Gießen, Germany

Spin-orbit effects play an important role in current spintronics research. One effect due to spin-orbit coupling is the magneto crystalline anisotropy (MCA) and the control of this effect by a bias voltage. Using density functional theory in combination with non-equilibrium Green's function method we calculate the bias voltage dependence of MCA for the case of a V/Fe/X/MgO/V. Thereby, X is a very thin layer of a high spin-orbit material as Bi and Pt. Further, we discuss the dependence of MCA and of the tunneling anisotropic magneto resistance (TAMR) on the Fe and MgO slab thicknesses. Further, we show the voltage dependence of spin-torque originated in these tunnel junctions and clarify the connection to the MCA. All our results are compared to recent experimental results in the same junctions.