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Micromagnetic Simulation of Vortex Development in Magnetic Bi-Material Bow-Tie Structures

1
Faculty of Engineering Sciences and Mathematics, Bielefeld University of Applied Sciences, 33619 Bielefeld, Germany
2
Institute of Physics-Center for Science and Education, Silesian University of Technology, 44-100 Gliwice, Poland
3
Karlsruhe Nano Micro Facility (KNMF), Karlsruhe Institute of Technology (KIT), 76344 Eggenstein-Leopoldshafen, Germany
*
Author to whom correspondence should be addressed.
Condens. Matter 2020, 5(1), 5; https://doi.org/10.3390/condmat5010005
Received: 1 December 2019 / Revised: 9 January 2020 / Accepted: 9 January 2020 / Published: 12 January 2020
Magnetic vortex structures are of high technological relevance due to their possible application in magnetic memory. Moreover, investigating magnetization reversal via vortex formation is an important topic in basic research. Typically, such vortices are only investigated in homogeneous magnetic materials of diverse shapes. Here, we report for the first time on micromagnetic simulation of vortex formation in magnetic bow-tie nanostructures, comprising alternating parts from iron and permalloy, investigated for two different thicknesses and under different angles of the external magnetic field. While no vortex was found in pure permalloy square, nanoparticles of the dimensions investigated in this study and in case of iron only a relatively thick sample allowed for vortex formation, different numbers of vortices and antivortices were found in the bow-tie structures prepared from both materials, depending on the angular field orientation and the sample thickness. By stabilizing more than one vortex in a confined nanostructure, it is possible to store more than one bit of information in it. Our micromagnetic simulations reveal that such bi-material structures are highly relevant not only for basic research, but also for data storage applications. View Full-Text
Keywords: magnetic nanostructures; micromagnetic simulation; bow-tie structure; vortex; magnetization reversal; iron, permalloy; lithography magnetic nanostructures; micromagnetic simulation; bow-tie structure; vortex; magnetization reversal; iron, permalloy; lithography
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Sudsom, D.; Juhász Junger, I.; Döpke, C.; Blachowicz, T.; Hahn, L.; Ehrmann, A. Micromagnetic Simulation of Vortex Development in Magnetic Bi-Material Bow-Tie Structures. Condens. Matter 2020, 5, 5.

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