Dresden 2017 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 65: Poster 2
MA 65.25: Poster
Freitag, 24. März 2017, 09:30–13:00, P2-OG1
Magnetocrystalline anisotropy of ultrathin, epitaxial magnetite and iron films on MgO(001) — •Kristina Sprenger, Jari Rodewald, and Joachim Wollschläger — Fachbereich Physik, Universität Osnabrück, Barbarastraße 7, 49076 Osnabrück
Ferrimagnetic materials as magnetite are very important nowadays. Combined with the wide field of spintronics, it’s an essential part of technological applications in many facets, for example in the development of non-decaying memories. For that it is very important to know the electric and magnetic properties of iron, magnetite and related materials.
In this work, the focus lies on the fabrication of Fe and Fe3O4 layers by reactive molecular beam epitaxy (RMBE) on MgO(001) and analyzing them towards their magnetic properties. For studying their chemical composition, x-ray photoelectron spectroscopy (XPS) is applied and the surface structure of the prepared films is characterized via low energy electron diffraction (LEED). The main focus lies on finding out about the magnetic properties of the thin films by vibrating sample magnetometry (VSM), ferromagnetic resonance (FMR) and the magneto-optical Kerr effect (MOKE).
The approach that is used focusses on the 360∘ in-plane orientation-dependent behaviour of all three measurement methods. Additionally, the dependency on the film thickness is evaluated. To do so, properties like remanence, coercivity and magnetocrystalline anisotropy, especially shifts in tetramerous and uniaxial anisotropy are analyzed in iron and magnetite films with different layer thicknesses.