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Article

Magnetization Reversal in Concave Iron Nano-Superellipses

Faculty of Engineering and Mathematics, Bielefeld University of Applied Sciences, 33619 Bielefeld, Germany
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Author to whom correspondence should be addressed.
Academic Editor: Carmine Attanasio
Condens. Matter 2021, 6(2), 17; https://doi.org/10.3390/condmat6020017
Received: 17 April 2021 / Revised: 8 May 2021 / Accepted: 11 May 2021 / Published: 12 May 2021
(This article belongs to the Special Issue Magnetic Nanoparticles and Nanodevices)
Square magnetic nanodots can show intentional or undesired shape modifications, resulting in superellipses with concave or convex edges. Some research groups also concentrated on experimentally investigating or simulating concave nano-superellipses, sometimes called magnetic astroids due to their similarity to the mathematical shape of an astroid. Due to the strong impact of shape anisotropy in nanostructures, the magnetization-reversal process including coercive and reversibility fields can be expected to be different in concave or convex superellipses than that in common squares. Here, we present angle-dependent micromagnetic simulations on magnetic nanodots with the shape of concave superellipses. While magnetization reversal occurs via meander states, horseshoe states or the 180° rotation of magnetization for the perfect square, depending on the angle of the external magnetic field, more complicated states occur for superellipses with strong concaveness. Even apparently asymmetric hysteresis loops can be found along the hard magnetization directions, which can be attributed to measuring minor loops since the reversibility fields become much larger than the coercive fields. View Full-Text
Keywords: nanostructure; iron; object-orientated micromagnetic framework (OOMMF); asymmetry; minor loop; coercive field; reversibility field nanostructure; iron; object-orientated micromagnetic framework (OOMMF); asymmetry; minor loop; coercive field; reversibility field
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MDPI and ACS Style

Öncü, E.; Ehrmann, A. Magnetization Reversal in Concave Iron Nano-Superellipses. Condens. Matter 2021, 6, 17. https://doi.org/10.3390/condmat6020017

AMA Style

Öncü E, Ehrmann A. Magnetization Reversal in Concave Iron Nano-Superellipses. Condensed Matter. 2021; 6(2):17. https://doi.org/10.3390/condmat6020017

Chicago/Turabian Style

Öncü, Emre; Ehrmann, Andrea. 2021. "Magnetization Reversal in Concave Iron Nano-Superellipses" Condens. Matter 6, no. 2: 17. https://doi.org/10.3390/condmat6020017

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