Regensburg 2013 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
MA: Fachverband Magnetismus
MA 14: Micromagetic Simulation and Electron Theory of Magnetism
MA 14.3: Vortrag
Dienstag, 12. März 2013, 10:00–10:15, H23
Multiscale study of Bloch points and their dynamics — •Christian Andreas1,2, Attila Kákay1, and Riccardo Hertel2 — 1Peter Grünberg Institut (PGI-6), Forschungszentrum Jülich GmbH, D-52428 Jülich, Germany — 2Institut de Physique et Chimie des Matériaux de Strasbourg, Université de Strasbourg, CNRS UMR 7504, Strasbourg, France
Compared to domain walls and (anti-) vortices, little is known about the dynamic properties of Bloch points (BPs) [1,2]. BPs are fundamental magnetic structures occurring, e.g., in vortex-type domain walls in nanocylinders [3] or transient when vortex cores switch [4]. They are difficult to treat in micromagnetism because of their maximally inhomogeneous structure and a singularity of the exchange energy density. This violates the basic micromagnetic assumption of smooth variations on atomistic length scales. The problem can be solved by using a Heisenberg model. In order to simulate a BP embedded into a mesoscopic domain structure we developed a multiscale code with a seamless coupling between an atomistic region of interest (ROI) and the magnetization calculated with our finite-element code TetraMag. By moving the ROI we can trace BPs during switching processes. We demonstrate the compatibility of the multiscale model with micromagnetic results and present examples of simulated BP dynamics.
E. Feldtkeller, Z. Angew. Phys. 19, 530 (1965)
W. Döring, J. Appl. Phys. 39, 1006 (1968)
R. Hertel and J. Kirschner, J. Magn. Magn. Mater. 3, L291 (2004)
R. Hertel et al., Phys. Rev. Lett. 11, 117201 (2007)