Berlin 2008 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 32: Postersession II: Spinstruct./Phase Trans. (1-10); Spinelectronics (11-15); Thin Films (16 - 36); Particles/Clusters (37-45); Multiferroics (46-54); Spindynamics/Spin Torque (55 - 76); Post Deadlines (77-79)

MA 32.22: Poster

Freitag, 29. Februar 2008, 11:15–14:00, Poster E

Magneto-optical Kerr effect measurements of Fe_3−xZn_xO₄ thin films — •Matthias Pelkner, Deepak Venkateshvaran, Andrea Boger, Andreas Brandlmaier, Matthias Opel, Sebastian T. B. Goennenwein, and Rudolf Gross — Walther-Meissner-Institut, Bayerische Akademie der Wissenschaften, Walther-Meissner-Str. 8, 85748 Garching

Magnetite (Fe₃O₄) is a very attractive candidate regarding spintronic devices, since it has a very high Curie temperature (T_C=860 K) and is considered a half metallic ferrimagnet. To tune its electronic and magnetic properties (carrier concentration and Curie temperature) it is attractive to replace a fraction of the Fe atoms by nonmagnetic ions, e.g. Zn.

We have prepared Fe_3−xZn_xO₄ thin films on MgO (100) single crystal substrates using pulsed laser deposition with different Zn concentration (x=0, 0.05, 0.1 and 0.5). The films were grown in Ar atmosphere at a pressure of 3.7× 10⁻³ mbar and a substrate temperature of 320^∘C. The crystalline quality of the films was checked with x-ray diffraction, and the magnetic properties were investigated by means of magneto-optical Kerr effect measurements at room temperature and SQUID magnetometry. We present a comparison of the magnetic properties of the films with different Zn content x, grown under identical conditions, and critically compare our findings with the properties of bulk Zinc ferrite spinels reported in the literature.

This work is supported by the DFG via SPP 1285.