Berlin 2024 – scientific programme
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MA: Fachverband Magnetismus
MA 13: Micro- and Nanostructured Magnetic Materials
MA 13.7: Talk
Monday, March 18, 2024, 16:30–16:45, EB 407
Magnetization dynamics of CoFe 3D tetrahedral nanostructures — •Bereket Ghebretinsae1, Christian Schröder2, Martin Lonsky1, Mohanad Al Mamoori1, Fabrizio Porrati1, Michael Huth1, and Jens Müller1 — 1Institute of Physics, Goethe University, 60438 Frankfurt (M), Germany — 2Institute for Applied Materials Research, University of Applied Sciences Bielefeld, Bielefeld 33619, Germany
Magnetic nanostructures have long attracted great research interest, especially because of their enormous relevance in technological applications, such as magnetic storage. In the past, the functionality of magnetic nanostructures has been limited mostly to two dimensions. However, recent advances in the synthesis of nanomaterials have enabled fabricating 3D nanostructures with complex geometries. The expansion into the third dimension leads to the emergence of new physical phenomena and the formation of complex spin textures, which potentially could be exploited in novel technologies. Here we present an in-depth study of the magnetization dynamics of CoFe 3D ferromagnetic nanostructure arrays fabricated via focused electron beam induced deposition (FEBID). The nanostructures were grown in two different configurations ontop of a micro-Hall sensor, and then studied via highly sensitive magnetic stray field measurements. There we detect characteristic magnetic switching cascades, which we explain, with the help of micromagnetic and macrospin simulations, as resulting from the reorientation dynamics of non-interacting uniaxial anisotropic magnetic grains, equal to a superposition of Stoner-Wolfarth particles.
Keywords: Nanostructures; FEBID; Micro-Hall; Magnetometry; CoFe