Dresden 2009 – scientific programme

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MA: Fachverband Magnetismus

MA 40: Poster II: Bio- and Molecular Magnetism (1-9); Magnetic Coupling Phenomena/Exchange Bias (10-15); Magnetic Particlicles and Clusters (16-29); Micro and Nanostructured Magnetic Materials (30-51); Multiferroics (52-64); Spin Injection in Heterostructures (65-67); Spin-Dyn./Spin-Torque (68-93); Spindependent Transport (94-108)

MA 40.39: Poster

Friday, March 27, 2009, 11:00–14:00, P1A

Tunable magnetic and magnetotransport properties of Zn_xFe_3−xO₄ epitaxial films — •Michael Wagner, Deepak Venkateshvaran, Matthias Althammer, Andrea Nielsen, Sebastian Goennenwein, Matthias Opel, and Rudolf Gross — Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, Garching, Germany

The structural, magnetic and transport properties of Zn_xFe_3−xO₄ are investigated in this work. Non-magnetic Zn²⁺, when substituted for Fe³⁺ in Fe₃O₄ allows one to tune the magnetic and electronic properties without losing mobility of the carriers [1]. We have grown coherently strained, epitaxial thin films of Zn_xFe_3−xO₄ on MgO (001) substrates using pulsed laser deposition. Two sets of Zn_xFe_3−xO₄ films were deposited, one with x = 0, 0.1, 0.5 and 0.9 grown in pure argon, and a second with x = 0, 0.1, 0.33 and 0.9 grown in an Ar/O₂ (99:1) mixture. X-ray diffractometry measurements indicate high crystallinity with an FWHM of 0.04^∘ in the rocking curves for the Zn_xFe_3−xO₄ (004) reflection. Magnetization measurements were performed using a SQUID magnetometer and magnetotransport properties were studied using micro-patterned Hall bars in magnetic fields up to 14 T. Our results are discussed within the framework of Zn substitution on the tetrahedral sites of Fe₃O₄, Fe vacancies, oxygen stoichiometry, and the exchange mechanisms responsible for ferrimagnetism [2]. This work was funded by the DFG within SPP 1285 and the DAAD.

[1] J. Takaobushi et al., Appl. Phys. Lett. 89, 242507 (2006)

[2] D. Venkateshvaran et al., arXiv:0808.3642 (2008)