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MM: Fachverband Metall- und Materialphysik

MM 33: Topical Session Electron Theory IV

MM 33.2: Topical Talk

Donnerstag, 17. März 2011, 11:30–12:00, IFW A

Metallic and half-metallic magnetism — •Jürgen Kübler — Technische Universität, Darmstadt, Germany

The topic of the talk is introduced by means of two (rather old) examples, RhMn3 and Mn3Sn; these are metallic magnets that order in different non-collinear moment arrangements. Density functional theory explains their peculiar ground states and allows a determination of the exchange interactions that result in fairly good estimates of their ordering temperatures. Work by Fähnle et al. on a fast approach to the simulation of spin dynamics is extended to Heusler compounds, for which the half-metallic gap is discussed together with examples of spin-wave spectra and the role of spin-orbit coupling. Some variants of tetragonal Heusler compounds are discussed that have magnetic properties which make them interesting for spintronics applications.