Magnetic properties of selected 3d- and 4f-systems on {α-Al_1tn2O_1tn3 [alpha-Al 2 O 3] substrates [Elektronische Ressource] / von Jens Oster

Magnetic properties of selected 3d- and4f- systems on fi-Al O substrates2 3Dissertationzur Erlangung des GradesDoktor der Naturwissenschaften (Dr.rer.nat.)am Fachbereich Physikder Johannes Gutenberg-Universit at MainzvonJens Ostergeb.in Bendorf/Rh.Mainz, 2003D77Tag der mundlic? hen Prufung:? 17.01.2005ContentsIntroduction 11 Preparatory operations 51.1 Properties of sapphire . . . . . . . . . . . . . . . . . . . . . . . . 61.1.1 Crystallography of sapphire . . . . . . . . . . . . . . . . . 6¯1.1.2 Faceting of sapphire (1010) . . . . . . . . . . . . . . . . . 71.1.3 Preparation of faceted sapphire . . . . . . . . . . . . . . . 101.2 Theory of magnetoelasticity . . . . . . . . . . . . . . . . . . . . . 161.2.1 Magnetoelasticity in bulk materials . . . . . . . . . . . . . 161.2.2 Strain in thin ferromagnetic films . . . . . . . . . . . . . . 211.2.3 Magnetoelastic coupling in thin films . . . . . . . . . . . . 211.2.4 The ΔE - effect . . . . . . . . . . . . . . . . . . . . . . . . 231.2.5 Magnetoelasticity of RFe alloys . . . . . . . . . . . . . . . 2421.3 Assembly of magnetoelasticity measurement setup . . . . . . . . . 291.4 Preparation method: Molecular Beam Epitaxy . . . . . . . . . . . 341.4.1 The MBE preparation chamber . . . . . . . . . . . . . . . 341.4.2 The MBE process . . . . . . . . . . . . . . . . 361.5 Crystallographic characterization by X-ray diffraction . . . . . . . 382 Thin transition metal films on sapphire m-plane 432.