Spin waves with high energy and momentum in ultrathin Co-films studied by spin polarized electron energy loss spectroscopy [Elektronische Ressource] / von Markus Etzkorn

Spin waves with high energy andmomentum in ultrathin Co-films studied byspin-polarized electron energy lossspectroscopyDissertationzur Erlangung des akademischen Gradesdoctor rerum naturalium (Dr. rer. nat.)vorgelegt derMathematisch-Naturwissenschaftlich-Technischen Fakult¨at(mathematisch-naturwissenschaftlicher Bereich)der Martin-Luther-Universit¨at Halle-Wittenbergvon Herrn Markus Etzkorngeb. am: 07. November 1975 in: BonnGutachter1. Prof. Dr. J. Kirschner2. Prof. Dr. W. Widdra3. Prof. Dr. C. BackHalle (Saale), den 31.1.2005urn:nbn:de:gbv:3-000008590[http://nbn-resolving.de/urn/resolver.pl?urn=nbn%3Ade%3Agbv%3A3-000008590]IIContents1 Introduction 12 Magnetic excitations and electron scattering 52.1 Interactions of spins in solids . . . . . . . . . . . . . . . . . . . . . . . . . . 52.2 Theoretical description of magnetic excitations . . . . . . . . . . . . . . . . 62.2.1 Spin waves within the Heisenberg description . . . . . . . . . . . . 82.2.2 Magnetic excitations in itinerant electron ferromagnets . . . . . . . 122.3 Established experimental methods to study spin wave excitations . . . . . 152.4 Electron scattering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 172.4.1 Elastic electron scattering . . . . . . . . . . . . . . . . . . . . . . . 182.4.2 Inelastic electron scattering . . . . . . . . . . . . . . . . . . . . . . 203 The experimental set-up 253.1 The spin-polarized electron energy loss spectrometer. . . . . . . . .