Dresden 2009 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 25: Micro- and Nanostructured Magnetic Materials II

MA 25.3: Vortrag

Mittwoch, 25. März 2009, 15:15–15:30, HSZ 403

Iron filled carbon nanotubes studied with the Magnetic Force Microscope under applied magnetic fields — •Matthias Lutz, Uhland Weißker, Christian Müller, Franziska Wolny, Martin Bauch, Thomas Mühl, Albrecht Leonhardt, Rüdiger Klingeler, and Bernd Büchner — Leibniz Institute for Solid State and Materials Research (IFW) Dresden, Germany

We present MFM (Magnetic Force Microscopy) studies of ferromagnetic nanowires formed inside carbon nanotubes (CNT) during the CVD (Chemical Vapour Deposition) growth process. The single domain configuration of the nanowires as well as their predominantly single crystal nature render them promising candidates for novel magnetic applications. The remanent magnetization states of the CNT encapsulated α-iron and iron carbide nanowires are contrasted as well es their switching behavior studied with the aid of applied magnetic fields. Measuring vertical arrays of α-Fe nanowires reveals a tip triggered switching, indicating a nucleation based magnetization reversal mechanism. Despite the extreme aspect ratio in Fe₃C nanowires the magnetization is aligned perpendicular to the long axis which is discussed in terms of the magnetocrystalline anisotropy in combination with a preferred crystal orientation.