Regensburg 2010 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 33: Poster II

MA 33.33: Poster

Freitag, 26. März 2010, 11:00–14:00, Poster B1

Influence of the magnetostatic coupling on the depinning field of geometrically pinned domain walls in adjacent magnetic nanostrips — •Felipe Garcia-Sanchez, Attila Kakay, and Riccardo Hertel — Institut für Festkörperforschung, Elektronische Eigenschaften, Forschungszentrum Jülich GmbH

Magnetic domain walls in thin strips (DW) have attracted much attention due to potential applications in logic and magnetic storage devices [1]. Such applications require dense arrays of ferromagnetic nanowires and artificial pinning sites to control the DW position. Recently, it has been reported that transverse DWs with different configurations (head-to-head and tail-to-tail) in adjacent wires attract each other, resulting in a non-zero DW depinning field [2]. However, it is still unclear to which extent this interaction influences the depinning from artificially defined sites. In this work we study by means of micromagnetic simulations the separation-dependent interaction between DWs in two permalloy rectangular nanowires containing a double notch. We show that the DW configuration and the relative chirality affect the field required for depinning from the notch. In the case of repulsive interaction, we found that the DWs are unstable at small separation distances since they can depin even without applying external fields. We have also quantified the effect of this interaction on the stability by calculating the energy barrier connected with the depinning mechanism. [1] S. S. P. Parkin, M. Hayashi, and L. Thomas, Science 320, 190 (2008). [2] L. O'Brien et al., Phys. Rev. Lett. 103, 077206 (2009).