Atomic order and magnetic properties in Ni-Mn-Sn
The functional properties of metamagnetic shape memory alloys Ni-Mn-Z (Z=In, Sn, Sb) ultimately rely on the magnetic coupling between Mn atoms, so the magnetic exchange strongly depends on the Mn-Mn distance and consequently in the atomic order. A complete correlation between atomic order and exchange interactions is therefore needed to properly tune the properties of these alloys. In Ni-Mn-Sn the high stability of the L21 structure precludes the variation of atomic order by means of conventional thermal treatments. To tackle this problem, a series of alloys has been elaborated with compositional range covering from fully ordered stoichiometric to well-disordered Mn-rich alloys. In addition to configurational disorder, the influence of mechanically-induced disorder has been also evaluated: all alloys have been studied both after mechanical milling and after a subsequent annealing. The proposed experiment is intended to analyze the variations on both the long-range atomic order and the magnetic structure resulting from both compositional and mechanically-induced disorder by means of high-resolution neutron diffraction, both in as-milled and annealed states,at different temperatures.
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LOPEZ GARCIA Javier; PEREZ DE LANDAZABAL Jose Ignacio; RECARTE Vicente; RODRIGUEZ VELAMAZAN Jose Alberto; SANCHEZ-ALARCOS Vicente and UNZUETA SOLOZABAL Iraultza. (2016). Atomic order and magnetic properties in Ni-Mn-Sn. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-24-591
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