Regensburg 2010 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 16: Micro- and Nanostructured Magnetic Materials II

MA 16.3: Vortrag

Mittwoch, 24. März 2010, 10:45–11:00, H23

Switching of individual Fe₃C nanowires with transverse magnetization — •Matthias U. Lutz, Uhland Weissker, Franziska Wolny, Markus Löffler, Thomas Mühl, Albrecht Leonhardt, Rüdiger Klingeler, and Bernd Büchner — Leibniz Institute for Solid State and Materials Research (IFW) Dresden, Germany

Iron carbide nanowires contained within a multiwalled carbon nanotube feature a transverse remanent magnetization where the magnetization vectors are perpendicular to the long wire axis. TEM studies on the CVD-grown nanotubes reveal that the fillings are single crystal Fe₃C nanowires with the crystallographic b-axis along the hollow of the tube, causing the magnetic easy c-axis to be perpendicular to the long axis of the wire. Comparing the magneto-crystalline and the shape anisotropy indicates that the former dominates. The two anisotropy contributions are orthogonal, resulting in a weak effective anisotropy favouring a transverse magnetization. The remanent magnetization as well as the switching behaviour are studied with the aid of a hr-MFM with an in-situ perpendicular magnetic field. The Fe₃C wires switch at around 30 mT. The mechanism of magnetization reversal is discussed along with possible applications of the system.