Dresden 2014 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 19: Poster I

MA 19.6: Poster

Dienstag, 1. April 2014, 13:00–15:30, P1

Structural and Magnetic Properties of Magnetite Thin Films grown by Low Oxygen Metalorganic Aerosol Deposition — •Victor Pfahl, Sebastian Hühn, Markus Jungbauer, and Vasily Moshnyaga — I Physikalisches Institut, Georg-August-Universität Göttingen, Göttingen, Germany

Magnetite (Fe₃O₄) is a ferrimagnet with an inverse spinel structure which has drawn attention in the field of spin electronics due to its half-metallic properties with 100% spin-polarization and its high T_C of 858K [1][2]. We have grown Fe₃O₄ thin-films on SrTiO₃, MgO and Al₂O₃ substrates with Low-Oxygen Metalorganic Aerosol Deposition (LO-MAD). Structural properties were characterized by XRR, XRD, STM, and Raman spectroscopy. Resistivity and magnetization were measured with PPMS, MPMS and MOKE. As we vary the oxygen ambient pressure, we are also able to grow different members of the Fe-O phase diagram like γ−Fe₂O₃, α−Fe₂O₃ and mixed phases. STM indicates epitaxial 2D island growth of the magnetite thin films with film thicknesses of 30nm to 50nm, island heights of one atomic layer, and RMS < 0.7nm. The saturation magnetization at 10K M_sat= (29.8 ± 3.8)µ_B is close to the theoretical value of M_sat=32µ_B. Financial support from EU FP 7, IFOX (interfacing oxides) project is acknowledged.

[1] Microstructure and magnetic properties of strained Fe3O4 films Chen, Y. Z. et al., Journal of Applied Physics, 103, 07D703 (2008).

[2] New Class of Materials: Half-Metallic Ferromagnets de Groot, R. A. et al. Phys. Rev. Lett. 50, 2024-2027 (1983)