Berlin 2018 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 8: Focus Session: Magnetic structurally and compositionally modulated nanowires and nanotubes
MA 8.6: Vortrag
Montag, 12. März 2018, 17:30–17:45, H 1012
Magnetization reversal and local switching fields of ferromagnetic microtubes with radial magnetization — •Norbert Puwenberg1, Christopher Friedrich Reiche1, Mishal Khan1, Robert Streubel2, Michael Melzer1, Oliver Schmidt1,3, Bernd Büchner1,4, and Thomas Mühl1 — 1IFW Dresden, Dresden, Germany — 2Lawrence Berkeley National Laboratory, Berkeley, USA — 3TU Chemnitz, Chemnitz, Germany — 4Technische Universität Dresden, Dresden, Germany
A simple type of three-dimensional magnetic nanostructures can be formed by rolling-up magnetic thin films. We investigated the field-dependent stray-field distribution of rolled-up Co/Pd nanomembranes [1] by multi-frequency magnetic force microscopy (MFM) under vacuum conditions. Stray field and topography were mapped simultaneously by employing mechanical and electrostatic AC excitation of the fundamental and the second flexural cantilever oscillation mode [2]. We will present MFM images showing demagnetized multi-domain states as well as homogeneous remanent states after saturation. The detailed evaluation of field-dependent MFM series shows that the spatially resolved switching fields depend on the angle between the direction of the applied magnetic field perpendicular to the tube axis and the local surface normal of the tube surface. Our data corresponds to an angle range of 0° to 65°, which points to a Kondorsky-type behavior of the magnetization reversal in our rolled up Co/Pd nanomembranes.
[1] R. Streubel et al., Nature Communications 6, 7612 (2015)
[2] J. Schwenk et al., Appl. Phys. Lett. 107, 132407 (2015)