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On the rich magnetic phase diagram of (Ni, Co)-Mn-Sn Heusler alloys
Univ Duisburg Essen, Fac Phys, D-47048 Duisburg, Germany.;Univ Duisburg Essen, CENIDE, D-47048 Duisburg, Germany..
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
Univ Duisburg Essen, Fac Phys, D-47048 Duisburg, Germany.;Univ Duisburg Essen, CENIDE, D-47048 Duisburg, Germany..
2016 (English)In: Journal of Physics D: Applied Physics, ISSN 0022-3727, E-ISSN 1361-6463, Vol. 49, no 39, 395001Article in journal (Refereed) Published
Abstract [en]

We put a spotlight on the exceptional magnetic properties of the metamagnetic Heusler alloy (Ni, Co)-Mn-Sn by means of first principles simulations. In the energy landscape we find a multitude of local minima, which belong to different ferrimagnetic states and are close in total magnetization and energy. All these magnetic states correspond to the local high spin state of the Mn atoms with different spin alignments and are related to the magnetic properties of Mn. Compared to pure Mn, the magneto-volume coupling is reduced by Ni, Co and Sn atoms in the lattice and no local low-spin Mn states appear. For the cubic phase we find a ferromagnetic ground state whereas the global energy minimum is a tetragonal state with a complicated spin structure and vanishing magnetization which so far has been overlooked in simulations.

Place, publisher, year, edition, pages
2016. Vol. 49, no 39, 395001
Keyword [en]
Ni-Mn-Sn, metamagnetism in Heusler alloys, metamagnetis magnetocaloric effect, magneto-structural transition
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:uu:diva-305303DOI: 10.1088/0022-3727/49/39/395001ISI: 000384097500001OAI: oai:DiVA.org:uu-305303DiVA: diva2:1038315
Funder
German Research Foundation (DFG), SPP 1599 GR 4792/1-2StandUp
Available from: 2016-10-18 Created: 2016-10-14 Last updated: 2016-10-18Bibliographically approved

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Herper, Heike C.
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