Dresden 2014 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 17: Spintronics (jointly with HL,TT)

MA 17.3: Vortrag

Dienstag, 1. April 2014, 14:15–14:30, HSZ 401

Calculating spin transport and magnetization dynamics parameters in textured magnetic materials — •Zhe Yuan — Faculty of Science and Technology, University of Twente, Enschede, The Netherlands — Institute of Physics, Johannes Gutenberg-University Mainz, Mainz, Germany

First-principles calculations allow us to understand the electronic and magnetic properties of real materials in terms of their chemical composition, atomic structure and magnetic configuration by numerically solving the quantum mechanical equations that describe the motion of the electrons. We have developed a unique first-principles formalism of scattering theory that can be used to calculate quantities such as the resistivity, Gilbert damping, and spin-transfer torque for a wide variety of material systems. In this talk, I will focus on how magnetic domain walls (DWs) modify the above transport and magnetization dynamics properties in real materials. Taking the technologically important Ni80Fe20 magnetic alloy, as an example, we have studied the change in its resistance due to the presence of a DW. The Gilbert damping in a DW is found to be anisotropic and drastically enhanced by the magnetization gradient, which has significant effects on field- and/or current-driven DW motion.