Dresden 2014 – scientific programme

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O: Fachverband Oberflächenphysik

O 37: Posters: Plasmonics, Electronic Structure and Spin-Orbit Interaction, Semiconductor and Insulator Surfaces, Nanostructures

O 37.70: Poster

Tuesday, April 1, 2014, 18:30–22:00, P2

Growth and magnetic properties of ultrathin iron oxide films on MgO(001) and STO(001) — •Nico Pathé, Olga Schuckmann, Tobias Schemme, Matthäus Witziok, Karsten Küpper, and Joachim Wollschläger — Fachbereich Physik, Universität Osnabrück, Barbarastr. 7, 49076 Osnabrück

In this work, ultrathin iron oxide films were reactively grown on MgO(001) and STO(001) at 250 ^∘C depositing Fe in 5·10⁻⁶ mbar oxygen. Previous to this, NiO interlayers were reactively grown on both materials at 250 ^∘C and an oxygen partial pressure of 10⁻⁵ mbar. All samples were investigated via X-Ray Photoelectron Spectroscopy (XPS) and X-Ray Absorption Spectroscopy (XAS). The surface structures were determined by Low Energy Electron Diffraction (LEED) and the magnetic properties of the films were analyzed with Magneto-Optic Kerr Effect (MOKE) and X-Ray Magnetic Circular Dichroism (XMCD). XPS data show that stoichiometric magnetite was grown on all surfaces. This result was confirmed by the expected (√2 ×√2)R45^∘ superstructure obtained in LEED measurements. XMCD results indicate that the substrate has a strong influence on the critical film thickness, where stoichiometric magnetite occurs. All ironoxide films were found to be ferrimagnetic and most of them show a fourfold magnetic in-plane anisotropy in MOKE studies.