Magnetostatic and magnetoresonance properties of Heusler alloys. Focus on nanotwinned epitaxial films of magnetic shape memory alloys
Prof. Vladimir Golub, V.G. Barykhtar Institute NASU of Ukraine, Kyiv, Ukraine

Date, Time
15.05, 15:00 - 16:00

This is a short overview of the previous and current investigations of Heusler alloys carried out by the author during almost twenty years. The main attention will be addressed to the magnetism of nanotwinned epitaxial films of magnetic shape memory alloys

The hierarchic twin structure of martensite of magnetic shape memory alloys, formed as a result of minimization of elastic energy down to atomic scale, is under intensive study nowadays. On the other hand, the much more sophisticated problem of the relationship between nanoscale twin structure and the magnetism has been tackled only recently.

It will be shown that the nanotwin structure affects not only the basic magnetic parameters of magnetic shape memory alloys, but also can change qualitatively its magnetic nature and related magnetodynamic properties. This will be illustrated, both theoretically and experimentally, on the prototype Ni–Mn–Ga and Ni(Co)–Mn–Sn epitaxial thin films, but the conclusions are also valid for other Heusler-type magnetic shape memory alloys, both in the form of thin films, ribbons and bulks.