Regensburg 2016 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 54: Electron Theory of Magnetism and Micromagnetic Simulations
MA 54.7: Vortrag
Freitag, 11. März 2016, 11:45–12:00, H34
Skyrmionic magnetization switching in nanorods — •Michalis Charilaou1, Hans-Benjamin Braun2, and Jörg Friedrich Löffler1 — 1Laboratory of Metal Physics and Technology, Department of Materials, ETH Zurich, Switzerland — 2School of Physics, University College Dublin, Ireland
Magnetization switching mechanisms in nanorods, i.e., cylindrical nanowires, have been investigated in great detail, experimentally, theoretically, and computationally, because of their promising potential for technological implementation in data-storage devices. Depending on the shape, dimension, and anisotropic properties of a nanowire, possible reversal mechanisms are quasi-coherent rotation, domain-wall nucleation, and curling, all of which can transform the magnetization continuously from one state to another. In this work, we will show via micromagnetic simulations that in nanorods the magnetization switches by forming two skyrmion lines of opposite chirality, which begin at the wire ends via curling and propagate towards the center. During the propagation of the skyrmion lines, the transformation of the magnetic structure is continuous, but for a full reversal topological point defects, such as Bloch points, need to be created such that the switching becomes irreversible.