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Tuning the magnetocrystalline anisotropy of Fe3Sn by alloying
Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden.
Materials Science, TU Darmstadt, Darmstadt, Germany.
Materials Science, TU Darmstadt, Darmstadt, Germany.
Materials Science, TU Darmstadt, Darmstadt, Germany.
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2019 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 99, no 2, article id 024421Article in journal (Refereed) Published
Abstract [en]

The electronic structure, magnetic properties, and phase formation of hexagonal ferromagnetic Fe3Sn-based alloys have been studied from first principles and by experiment. The pristine Fe3Sn compound is known to fulfill all the requirements for a good permanent magnet, except for the magnetocrystalline anisotropy energy (MAE). The latter is large, but planar, i.e., the easy magnetization axis is not along the hexagonal c direction, whereas a good permanent magnet requires the MAE to be uniaxial. Here we consider Fe3Sn0.75M0.25, where M = Si, P, Ga, Ge, As, Se, In, Sb, Te, Pb, and Bi, and show how different dopants affect the MAE and can alter it from planar to uniaxial. The stability of the doped Fe3Sn phases is elucidated theoretically via the calculations of their formation enthalpies. A micromagnetic model is developed to estimate the energy density product (BH)(max) and coercive field mu H-0(c) of a potential magnet made of Fe3Sn0.75M0.25, the most promising candidate from theoretical studies. The phase stability and magnetic properties of the Fe3Sn compound doped with Sb and Mn have been checked experimentally on the samples synthesised using the reactive crucible melting technique as well as by solid state reaction. The Fe3Sn-Sb compound is found to be stable when alloyed with Mn. It is shown that even small structural changes, such as a change of the c/a ratio or volume, that can be induced by, e.g., alloying with Mn, can influence anisotropy and reverse it from planar to uniaxial and back.

Place, publisher, year, edition, pages
American Physical Society, 2019. Vol. 99, no 2, article id 024421
National Category
Materials Engineering Condensed Matter Physics
Identifiers
URN: urn:nbn:se:oru:diva-72084DOI: 10.1103/PhysRevB.99.024421ISI: 000456301900005Scopus ID: 2-s2.0-85060392732OAI: oai:DiVA.org:oru-72084DiVA, id: diva2:1285868
Funder
Swedish Research Council
Note

Funding Agencies:

NOVAMAG project, EU Horizon 2020 Framework Programme  686056 

STandUPP  

eSSENCE  

KAW foundation  2012.0031  2013.0020 

Available from: 2019-02-05 Created: 2019-02-05 Last updated: 2019-02-05Bibliographically approved

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Eriksson, Olle

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