Berlin 2018 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 21: Poster I
MA 21.20: Poster
Dienstag, 13. März 2018, 09:30–13:00, Poster A
Magnetic exchange coupling in Fe3O4/CoO bilayers on MgO(001) — •Kevin Ruwisch, Jari Rodewald, and Joachim Wollschläger — Fachbereich Physik, Universität Osnabrück, Barbarastr. 7, 49079 Osnabrück
Spintronics is a rising field of research in physics. Magnetite as a ferrimagnet and cobaltoxide as an antiferromagnet have become more important for industrial applications in spintronics over the years. For instance, magnetite is used in magnetoresistive random-access memory (MRAM) consisting of magnetic tunnel junctions (MTJ). Thus, improving the magnetic properties of ferrimagnetic films and ferrimagnetic/antiferromagnetic bilayers for spintronic devices is very important since antiferromagnetic films serve as pinning layers due to exchange bias.
Hence, in this work CoO and Fe3O4/CoO bilayers, grown by reactive molecular beam epitaxy (RMBE) on MgO(001), are investigated temperature-dependent via vibrating sample magnetometry (VSM). Furthermore, cubic magnetic anisotropy (CMA) measurements are performed. The composition as well as the surface structure have been characterized by in-situ x-ray photoelectron spectroscopy (XPS) and low-energy electron diffraction (LEED), respectively.
One approach of characterizing the magnetic features of CoO and Fe3O4/CoO is to evaluate the impact of CoO towards coercivity, remanence, magnetocrystalline anisotropy and especially the exchange bias.