Direct Observation of Transverse and Vortex Metastable Magnetic Domains observed in Cylindrical Nanowires

We present experimental evidence of metastable magnetic domains in cylindrical CoNi nanowires. Transverse (perpendicular) domains have been previously observed only in flat nanostrips. Here they are found together with more conventional vortex domains along the same cylindrical nanowire, denoting a...

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Bibliographic Details
Published in:arXiv.org 2017-05
Main Authors: Bran, C, Fernandez-Roldan, J A, Palmero, E M, Berganza, E, Guzman, J, del Real, R P, Asenjo, A, A Fraile Rodriguez, Foerster, M, Aballe, L, Chubykalo-Fesenko, O, Vazquez, M
Format: Article
Language:English
Subjects:
Dichroism
Emission analysis
Hysteresis loops
Kerr magnetooptical effect
Magnetic domains
Nanowires
Recording
Vortices
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Summary:We present experimental evidence of metastable magnetic domains in cylindrical CoNi nanowires. Transverse (perpendicular) domains have been previously observed only in flat nanostrips. Here they are found together with more conventional vortex domains along the same cylindrical nanowire, denoting a bistable system with similar free energies. The surface and the inner magnetization distribution in both types of domains are analyzed by Photo-Emission Electron Microscopy (PEEM) with X-ray magnetic circular dichroism (XMCD) contrast, and hysteresis loop in individual nanowires are measured by Magneto-optical Kerr effect. These experimental data are understood and compared with complementary micromagnetic simulations. The transverse domain states are potentially more important for sensing and recording applications than commonly observed vortex domains since they create larger surface stray fields.
ISSN:2331-8422
DOI:10.48550/arxiv.1705.04615