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Regensburg 2019 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 43: Micro- and nanostructured magnetic materials

MA 43.7: Vortrag

Donnerstag, 4. April 2019, 11:00–11:15, H52

Dynamical magnetic properties of individual permalloy nanotubesMichael Zimmermann1, Thomas Meier1, Elisabeth Josten2, Kilian Lenz3, Rysard Narkovic3, Jürgen Lindner3, Christian Horst Back4, and •Attila Kakay31Physics Department, Universität Regensburg, Universitätsstr. 31, D-93040 Regensburg, Germany — 2Forschungszentrum Jülich, Ernst Ruska-Center, Jülich, Germany — 3Helmholtz-Zentrum Dresden - Rossendorf, Institute of Ion Beam Physics and Materials Research, 01328 Dresden, Germany — 4Technical University Munich, Physics Department, München, Germany

Magnetic nanostructures extending into the third dimension are intensively studied nowadays due to their possible use as building blocks for future applications as dense magnetic memories, logical devices or magnetic sensors. Recently we have shown that the ground states of the individual nanotubes with hexagonal cross section can be manipulated with static and rf magnetic fields[1]. Here, we present a detailed study on the ferromagnetic response of such individual nanotubes. Finite element micromagnetic simulations are used to interpret the measurement data. We show that the main FMR mode excited in the axially magnetised case for the modes counter-propagating around the circumference is not degenerate. The lifting of the degeneracy is due to the hexagonal shape. Moreover, the presence of the curvature induced magnetochiral effect strongly suppresses one of the modes. [1] M. Zimmermann et. al, Nano Letters 18, 2828 (2018)

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