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Regensburg 2019 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 15: Magnetism Poster A

MA 15.84: Poster

Dienstag, 2. April 2019, 10:00–13:00, Poster E

Characterization of the exchange bias system Fe3O4/CoO via SQUID and VSM — •Kevin Ruwisch, Jari Rodewald, and Joachim Wollschläger — Fachbereich Physik, Universität Osnabrück, Barbarastraße 7, 49076 Osnabrück

Spintronics is a rising field of research in physics. Here, 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/antiferromagnetic bilayers for spintronic devices is very important since antiferromagnetic films serve as pinning layers, e.g., for MTJs due to exchange bias.

Hence, in this work Fe3O4/CoO bilayers, grown by reactive molecular beam epitaxy (RMBE) on MgO(001), are investigated via temperature-dependent vibrating sample magnetometry (VSM) and superconducting quantum interference device (SQUID). Hysteresis as well as temperature dependent magnetization measurements were 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 Fe3O4/CoO is to evaluate the impact of CoO towards coercivity, remanence, magnetocrystalline anisotropy and especially the exchange bias. Additionally the blocking temperature with respect to the film thickness of the antiferromagnetic layer is investigated.

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