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Induction of uniaxial anisotropy by controlled phase separation in Y-Co thin films

Sharma, S. and Ohmer, Dominik and Zintler, Alexander and Major, Marton and Radulov, Iliya and Kunz, Ulrike and Komissinskiy, Philipp and Xu, Bai-Xiang and Zang, H. and Molina-Luna, Leopoldo and Skokov, Konstantin P. and Alff, Lambert (2020):
Induction of uniaxial anisotropy by controlled phase separation in Y-Co thin films.
In: Physical Review B, 102 (1), pp. 014435. American Physical Society, ISSN 1098-0121,
DOI: 10.1103/PhysRevB.102.014435,
[Article]

Abstract

In this study, molecular beam epitaxy is utilized to stabilize a nanostructured thin-film magnet consisting of a soft magnetic Y2Co17 exchange coupled to hard magnetic YCo5. While, typically, a phase decomposition can be obtained in rare-earth cobalt systems only by the addition of further elements like Cu, Fe, and Zr and complex heat treatments, here we directly induce phase separation by growth kinetics. The resulting nanoscale architecture, as revealed by cross-sectional transmission electron microscopy, is composed of a network of coherently interlinked and aligned Y2Co17 and YCo5 building blocks. The formation of coherent precipitations is facilitated by the perfectly matching lattice constants, atomic species, and crystal symmetry of the two phases with vastly different magnetocrystalline anisotropies. The hard magnetic phase induces an aligned uniaxial anisotropy in Y2Co17, resulting in substantial coercivity associated with enhanced energy products. This work highlights the importance of thin-film epitaxy in understanding magnetic hardening mechanisms and suggests strategies for a rational design of future sustainable magnetic systems.

Item Type: Article
Erschienen: 2020
Creators: Sharma, S. and Ohmer, Dominik and Zintler, Alexander and Major, Marton and Radulov, Iliya and Kunz, Ulrike and Komissinskiy, Philipp and Xu, Bai-Xiang and Zang, H. and Molina-Luna, Leopoldo and Skokov, Konstantin P. and Alff, Lambert
Title: Induction of uniaxial anisotropy by controlled phase separation in Y-Co thin films
Language: English
Abstract:

In this study, molecular beam epitaxy is utilized to stabilize a nanostructured thin-film magnet consisting of a soft magnetic Y2Co17 exchange coupled to hard magnetic YCo5. While, typically, a phase decomposition can be obtained in rare-earth cobalt systems only by the addition of further elements like Cu, Fe, and Zr and complex heat treatments, here we directly induce phase separation by growth kinetics. The resulting nanoscale architecture, as revealed by cross-sectional transmission electron microscopy, is composed of a network of coherently interlinked and aligned Y2Co17 and YCo5 building blocks. The formation of coherent precipitations is facilitated by the perfectly matching lattice constants, atomic species, and crystal symmetry of the two phases with vastly different magnetocrystalline anisotropies. The hard magnetic phase induces an aligned uniaxial anisotropy in Y2Co17, resulting in substantial coercivity associated with enhanced energy products. This work highlights the importance of thin-film epitaxy in understanding magnetic hardening mechanisms and suggests strategies for a rational design of future sustainable magnetic systems.

Journal or Publication Title: Physical Review B
Journal volume: 102
Number: 1
Publisher: American Physical Society
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Advanced Electron Microscopy (aem)
11 Department of Materials and Earth Sciences > Material Science > Advanced Thin Film Technology
11 Department of Materials and Earth Sciences > Material Science > Mechanics of functional Materials
11 Department of Materials and Earth Sciences > Material Science > Physical Metallurgy
Zentrale Einrichtungen
Zentrale Einrichtungen > University IT-Service and Computing Centre (HRZ)
Zentrale Einrichtungen > University IT-Service and Computing Centre (HRZ) > Hochleistungsrechner
Date Deposited: 23 Jul 2020 06:29
DOI: 10.1103/PhysRevB.102.014435
Official URL: https://journals.aps.org/prb/abstract/10.1103/PhysRevB.102.0...
Projects: German Research Foundation (DFG), Grant number 405553726-TRR 270, German Research Foundation (DFG), Grant number MO 3010/31, Deutscher Akademischer Austausch Dienst (DAAD), LOEWE project RESPONSE, European Research Council (ERC), Grant number 805359-FOXON
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