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  Influence of crystalline defects on magnetic nanodomains in a rare-earth-free magnetocrystalline anisotropic alloy

Palanisamy, D., Kovács, A., Hegde, O., Dunin-Borkowski, R. E., Raabe, D., Hickel, T., et al. (2021). Influence of crystalline defects on magnetic nanodomains in a rare-earth-free magnetocrystalline anisotropic alloy. Physical Review Materials, 5(6): 064403. doi:10.1103/PhysRevMaterials.5.064403.

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Influence of crystalline defects on magnetic nanodomains in a rare-earth-free magnetocrystalline anisotropic alloy - PhysRevMaterials.5.pdf (Publisher version), 2MB
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Influence of crystalline defects on magnetic nanodomains in a rare-earth-free magnetocrystalline anisotropic alloy - PhysRevMaterials.5.pdf
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2021
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 Creators:
Palanisamy, Dhanalakshmi1, Author              
Kovács, András2, Author              
Hegde, Omkar3, Author              
Dunin-Borkowski, Rafal E.4, Author              
Raabe, Dierk5, Author              
Hickel, Tilmann3, Author              
Gault, Baptiste1, 6, Author              
Affiliations:
1Atom Probe Tomography, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863384              
2Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons and Peter Grünberg Institute 5, Forschungszentrum Jülich, 52425 Jülich, Germany, ou_persistent22              
3Computational Phase Studies, Computational Materials Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863341              
4Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons, Forschungszentrum Jülich GmbH, Jülich, Germany, ou_persistent22              
5Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863381              
6Imperial College, Royal School of Mines, Department of Materials, London, SW7 2AZ, UK, ou_persistent22              

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Free keywords: Aluminum alloys; Binary alloys; Calculations; Crystallography; Domain walls; Magnetic domains; Magnetic structure; Magnetization; Manganese alloys; Rare earths; Strategic materials, Ab initio calculations; Anisotropic alloys; Atomic-scale analysis; Crystalline defects; Crystalline imperfection; Domain wall energy; Domain wall motion; Local magnetization, Nanocrystalline materials
 Abstract: A complex interplay between magnetic domain structure and crystalline imperfections, here twins, is revealed in a rare-earth-free MnAl bulk magnet. The magnetic domains are observed to be in the nanometer range for a large part of the magnetic structure and to scale with the number density of twins formed during thermal processing. We explain this phenomenon by a reduction in domain-wall energy at the twinned regions as proven by ab initio calculations. In addition, our atomic-scale analysis reveals that the twin boundaries contain excess Mn atoms that reduce the local magnetization, serving as an obstacle for domain wall motion. These insights can help guide the strategic design of magnetic materials by controlling the initial phase distribution to tailor the twin density and hence, the distribution of domains. © 2021 authors.

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Language(s): eng - English
 Dates: 2021-06-02
 Publication Status: Published in print
 Pages: -
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 Identifiers: DOI: 10.1103/PhysRevMaterials.5.064403
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Title: Physical Review Materials
  Abbreviation : Phys. Rev. Mater.
Source Genre: Journal
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Publ. Info: College Park, MD : American Physical Society
Pages: - Volume / Issue: 5 (6) Sequence Number: 064403 Start / End Page: - Identifier: ISSN: 2475-9953
CoNE: https://pure.mpg.de/cone/journals/resource/2475-9953