Magnetization Reversal in Concave Iron Nano-Superellipses
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 si...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-05-01
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| Series: | Condensed Matter |
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| Online Access: | https://www.mdpi.com/2410-3896/6/2/17 |
| _version_ | 1797534420921483264 |
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| author | Emre Öncü Andrea Ehrmann |
| author_facet | Emre Öncü Andrea Ehrmann |
| author_sort | Emre Öncü |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-03-10T11:29:22Z |
| format | Article |
| id | doaj.art-10d53d53fd2d4299902572b290a4a2e2 |
| institution | Directory Open Access Journal |
| issn | 2410-3896 |
| language | English |
| last_indexed | 2024-03-10T11:29:22Z |
| publishDate | 2021-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Condensed Matter |
| spelling | doaj.art-10d53d53fd2d4299902572b290a4a2e22023-11-21T19:20:37ZengMDPI AGCondensed Matter2410-38962021-05-01621710.3390/condmat6020017Magnetization Reversal in Concave Iron Nano-SuperellipsesEmre Öncü0Andrea Ehrmann1Faculty of Engineering and Mathematics, Bielefeld University of Applied Sciences, 33619 Bielefeld, GermanyFaculty of Engineering and Mathematics, Bielefeld University of Applied Sciences, 33619 Bielefeld, GermanySquare 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.https://www.mdpi.com/2410-3896/6/2/17nanostructureironobject-orientated micromagnetic framework (OOMMF)asymmetryminor loopcoercive field |
| spellingShingle | Emre Öncü Andrea Ehrmann Magnetization Reversal in Concave Iron Nano-Superellipses Condensed Matter nanostructure iron object-orientated micromagnetic framework (OOMMF) asymmetry minor loop coercive field |
| title | Magnetization Reversal in Concave Iron Nano-Superellipses |
| title_full | Magnetization Reversal in Concave Iron Nano-Superellipses |
| title_fullStr | Magnetization Reversal in Concave Iron Nano-Superellipses |
| title_full_unstemmed | Magnetization Reversal in Concave Iron Nano-Superellipses |
| title_short | Magnetization Reversal in Concave Iron Nano-Superellipses |
| title_sort | magnetization reversal in concave iron nano superellipses |
| topic | nanostructure iron object-orientated micromagnetic framework (OOMMF) asymmetry minor loop coercive field |
| url | https://www.mdpi.com/2410-3896/6/2/17 |
| work_keys_str_mv | AT emreoncu magnetizationreversalinconcaveironnanosuperellipses AT andreaehrmann magnetizationreversalinconcaveironnanosuperellipses |