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MA: Fachverband Magnetismus
MA 16: Invited Talks Ebels / Manosa
MA 16.2: Hauptvortrag
Mittwoch, 28. März 2007, 14:30–15:00, H10
Multifunctional Ni-Mn-based shape memory alloys — •Lluis Manosa1, Xavier Moya1, Antoni Planes1, Seda Aksoy2, Thorsten Krenke2, Mehmet Acet2, and Eberhard Wassermann2 — 1Departament d'Estructura i Constituents de la Materia, Facultat de Fisica, Universitat de Barcelona — 2Experimentalphysk, Duisburg-Essen University
A relevant functional property is the capability of changing shape by application of a magnetic field. This is the magnetic shape memory property which has been reported for several magnetic alloys undergoing martenstic transiti-ons. Such a property relies on a high magnetic anisotropy of the martensitic phase along with a high mobility of mar-tensitic interfaces which results in a re-orientation of martensitic domains under the application of a magnetic field. The most promising magnetic shape memory compounds belong to the Ni-Mn-X family whereby the Ni-Mn-Ga is the prototypical magnetic shape memory alloy. In the recent years, studies for X=Sn,In and Sb have revealed the exis-tence of new properties: magnetic superelasticity, giant magnetocaloric effect (conventional and inverse) and giant magnetoresistance, all of them related to the modification in the coupling between structure and magnetism linked to the martensitic phase change. Typically several of these effects are encountered in a single alloy so that these materials can be considered as being multifunctional. In my talk I will review some of the most elevant features of the coupling between magnetism and structure in the Ni-Mn-X alloy family, and the functional properties derived from such a coupling will be discussed.