Dresden 2020 – scientific programme

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MA: Fachverband Magnetismus

MA 6: Micro- and Nanostructured Materials (joint session MA/TT)

MA 6.2: Talk

Monday, March 16, 2020, 09:45–10:00, HSZ 403

Magnetization reversal in round and square nanodots — •Andrea Ehrmann¹ and Tomasz Blachowicz² — ¹Bielefeld University of Applied Sciences, Faculty of Engineering and Mathematics, Bielefeld, Germany — ²Silesian University of Technology, Institute of Physics - Center for Science and Education, Gliwice, Poland

Ferromagnetic nanodots in different shapes can be applied in data storage, spintronics, neuromorphic computing, etc. Especially the possibility to create vortex states is of high technological interest since these states have significantly reduced stray fields and correspondingly less interaction with neighboring nanodots. Whether a vortex state occurs in the absence of an external magnetic field, depends on the dimensions of the nanodots and, in case of not round nanoparticles, on the shape, since the shape anisotropy significantly influences magnetization reversal processes.

Here we give an overview of magnetization reversal processes in square [1] and round nanodots [2], often including a single-vortex state, while in some cases two, three or even more vortex-antivortex pairs can be found. We also show the stability of single vortex ground states, i.e. the states usually suggested for data storage, which depends strongly on the dot geometry.

[1] A. Ehrmann, T. Blachowicz, Hyperfine Interactions 239, 8 (2018)

[2] A. Ehrmann, T. Blachowicz, J. Magn. Magn Mater. 475, 727-733 (2019)