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Tuning the Magnetic Anisotropy of NiPtMnGa by Substitution and Epitaxial Strain
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.ORCID iD: 0000-0001-6159-1244
Univ Duisburg Essen, Fac Phys, D-47048 Duisburg, Germany;Univ Duisburg Essen, CENIDE, D-47048 Duisburg, Germany.
2019 (English)In: IEEE transactions on magnetics, ISSN 0018-9464, E-ISSN 1941-0069, Vol. 55, no 2, article id 2100804Article in journal (Refereed) Published
Abstract [en]

Large magnetocrystalline anisotropy (MCA) is of high technical relevance, in particular for magnetic actuators, permanent magnets, and memory devices with high density. Large MCAs have been reported for the low temperature L1(0) phase of Ni2MnGa. Both, Mn and Pt substitution can stabilize this phase at and above room temperature. Despite the larger spin-orbit coupling in the heavy 5d-element Pt, it has been reported that Pt substitution may result in degeneration of the MCA. In this paper, we study the MCA for a combination of epitaxial strain and Mn and Pt substitution based on density functional theory methods. We show that one can stabilize both large uniaxial and easy-plane anisotropies depending on the value of strain. In particular, small changes of the applied strain may allow to switch between low- and high-anisotropy states or even switch the direction of the easy-axis magnetization direction.

Place, publisher, year, edition, pages
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC , 2019. Vol. 55, no 2, article id 2100804
Keywords [en]
Ab initio investigations, Heusler alloys, magnetic properties, magnetocrystalline anisotropy (MCA), thin films
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:uu:diva-377682DOI: 10.1109/TMAG.2018.2856461ISI: 000457677400001OAI: oai:DiVA.org:uu-377682DiVA, id: diva2:1291552
Funder
Swedish Foundation for Strategic Research StandUpGerman Research Foundation (DFG), SPP 1599German Research Foundation (DFG), GR 4792/1-2Available from: 2019-02-25 Created: 2019-02-25 Last updated: 2019-02-25Bibliographically approved

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Herper, Heike C.

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