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Proceedings Paper

Structural, magnetic, and Magneto optical properties of Fe3O4/NiO bilayers on MgO(001)
Author(s): Joachim Wollschläger; Tobias Schemme; Olga Kuschel; Matthäus Witziok; Timo Kuschel; Karsten Kuepper
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Paper Abstract

Ultrathin magnetite (Fe3O4) films are attractive for applications in the field of spintronics due to their ferrimagnetic behavior with assumed high degree of spin polarized electrons at the Fermi energy. For these applications, it is necessary to form epitactical bilayer structure combining ferrimagnetic magnetite with an antiferromagnetic layer. Therefore, here we study Fe3O4/NiO bilayers on MgO(001) substrates. Bilayers grown by reactive molecular beam epitaxy are stoichiometric and have well-developed surface and interface structures. The NiO layers are laterally pinned to the structure of the MgO(001) substrate while the magnetite films gradually relax. The interfaces show smooth morphologies and the films have very homogeneous film thickness necessary for spintronical applications. The magnetic and magneto optical properties of the Fe3O4/NiO bilayers were probed by the magneto optical Kerr effect. Compared to single Fe3O4 layers on MgO(001), the bilayers show complicated ferrimagnetic behavior depending on the azimuthal direction of the external applied field. The coercive field of the bilayers, however, is increased with the coercive field of single layer Fe3O4/MgO(001) structures making the Fe3O4/NiO bilayers attractive for spintronic applications.

Paper Details

Date Published: 27 February 2016
PDF: 13 pages
Proc. SPIE 9749, Oxide-based Materials and Devices VII, 974917 (27 February 2016); doi: 10.1117/12.2219627
Show Author Affiliations
Joachim Wollschläger, Univ. Osnabrück (Germany)
Ctr. of Physics and Chemistry of New Materials (Germany)
Tobias Schemme, Univ. Osnabrück (Germany)
Ctr. of Physics and Chemistry of New Materials (Germany)
Olga Kuschel, Univ. Osnabrück (Germany)
Ctr. of Physics and Chemistry of New Materials (Germany)
Matthäus Witziok, Univ. Osnabrück (Germany)
Ctr. of Physics and Chemistry of New Materials (Germany)
Timo Kuschel, Bielefeld Univ. (Germany)
Karsten Kuepper, Univ. Osnabrück (Germany)
Ctr. of Physics and Chemistry of New Materials (Germany)


Published in SPIE Proceedings Vol. 9749:
Oxide-based Materials and Devices VII
Ferechteh H. Teherani; David C. Look; David J. Rogers, Editor(s)

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