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Finite temperature magnetic properties of CrxCoyNi100-x-y medium entropy alloys from first principles
KTH Royal Inst Technol, Dept Mat Sci & Engn, Appl Mat Phys, SE-10044 Stockholm, Sweden.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory. KTH Royal Inst Technol, Dept Mat Sci & Engn, Appl Mat Phys, SE-10044 Stockholm, Sweden; Wigner Res Ctr Phys, Res Inst Solid State Phys & Opt, POB 49, H-1525 Budapest, Hungary.ORCID iD: 0000-0003-2832-3293
2019 (English)In: Scripta Materialia, ISSN 1359-6462, E-ISSN 1872-8456, Vol. 171, p. 78-82Article in journal (Refereed) Published
Abstract [en]

The magnetic structure of polymorphic Cr-Co-Ni medium entropy alloys is investigated as a function of temperature and chemical composition by ab initio calculations. Besides the thermal lattice expansion, the longitudinal spin fluctuations (LSFs) are accounted for in determining the magnetic state at finite temperature. We show that sizable local magnetic moments persist on all alloy components in the paramagnetic state for both face-centered cubic and hexagonal close-packed structures, and each alloy species exhibits particular temperature and concentration dependencies. The crucial role of LSFs for the finite temperature magnetic state and its impact on the temperature dependent elastic parameters are demonstrated.

Place, publisher, year, edition, pages
PERGAMON-ELSEVIER SCIENCE LTD , 2019. Vol. 171, p. 78-82
Keywords [en]
Medium entropy alloy, Magnetism, Spin fluctuations, Chemical fluctuations, Ab initio calculation
National Category
Condensed Matter Physics Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:uu:diva-393322DOI: 10.1016/j.scriptamat.2019.06.019ISI: 000479026100016OAI: oai:DiVA.org:uu-393322DiVA, id: diva2:1355384
Funder
Swedish Research Council, 2015-5335Swedish Research Council, 2017-06474Swedish Foundation for Strategic Research , S14-0038Swedish Foundation for Strategic Research , SM16-0036Carl Tryggers foundation Available from: 2019-09-27 Created: 2019-09-27 Last updated: 2019-09-27Bibliographically approved

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Vitos, Levente

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