Berlin 2018 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 8: Focus Session: Magnetic structurally and compositionally modulated nanowires and nanotubes

MA 8.4: Hauptvortrag

Montag, 12. März 2018, 16:15–16:45, H 1012

Controlled domain wall propagation in cylindrical nanowires — •Cristina Bran — Institute of Materials Science of Madrid, CSIC, 281049 Madrid, Spain

Cylindrical magnetic nanowires represent an alternative for nanotechnological applications such as 3D magnetic recording [1], actuators or sensors and logical devices where the control over the position and motion of domain wall (DW) is crucial. The nanowires present important advantages such as: the possibility to tailor the DW shape or the stability and high velocity of DW during its motion due to suppression of Walker breakdown [2]. Here we show a way of controlling DW propagation in these one-dimensional nanostructures by specific designs in geometry (i.e., modulations of diameter), or in magnetic anisotropy (i.e., modulations in the composition) [3]. In this way, the modulation will act as pinning center for nucleation, pinning and depinning of DWs. These local variations changes the typical single-domain state present in soft NWs, as well as the mono domain wall-type switching of the magnetization based on the DW nucleation and propagation. A detailed description of the magnetic configuration of individual cylindrical Co-based NWs is presented by combining XMCD-PEEM which allows resolving the surface and the internal magnetic structure of NWs, magneto-optical Kerr effect and micromagnetic simulations. [1]. S. Parkin et al., Nature Nanotechnology 10, 195 (2015). [2]. M. Yan et. al. Phys. Rev. Lett. 104 (2010) 057201 [3]. C. Bran et al., J. Mater. Chem. C 4, 978 (2016)