Berlin 2012 – scientific programme
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MA: Fachverband Magnetismus
MA 52: Poster II - Magnetic Heusler compounds, Magnetic shape memory alloys, Thin Films, Micro-/Nano-structured magnetic materials, Graphene, Spins in organics, Magnetic imaging, Surface Magnetism, Spin excitations/Torque, Spincaloric transport
MA 52.15: Poster
Friday, March 30, 2012, 11:00–14:00, Poster A
Structural and magnetic properties of zinc ferrite thin films grown by pulsed-laser deposition — •Kerstin Brachwitz1, Marcus Jenderka1, Andrey Timopheev2, Alexandre Azevedo2, Nikolai Sobolev2, Annette Setzer1, Pablo Esquinazi1, Michael Lorenz1, and Marius Grundmann1 — 1Institut für Experimentelle Physik II, Universität Leipzig, Germany — 2Departamento de Fisíca and I3N, Universidade de Aveiro, Portugal
Zinc ferrite (ZnFe2O4) is a promising candidate for the application in magnetic tunnel junctions due to its ferrimagnetic properties. In this regard, we investigated the structural and magnetic properties of ZnFe2O4 thin films grown by pulsed-laser deposition on different substrates at various substrate temperatures (TS).
X-ray diffraction measurements reveal an increasing crystalline quality of the films with increasing TS. Epitaxial single phase ZnFe2O4 (100) thin films were observed on SrTiO3 (100) substrates, whereas no symmetric ZnFe2O4 reflexes were observed for thin films deposited on r-plane sapphire independent of TS.
Magnetic properties were studied by static magnetization and ferromagnetic resonance (FMR) measurements. All films show a strong magnetic ordering, even if the zinc ferrite spinel phase has not been detected. However, energy dispersive X-ray spectroscopy studies reveal a stoichiometric Zn/Fe ratio. FMR measurements revealed fourfold cubic magnetic anisotropy of ZnFe2O4 thin films grown on SrTiO3. The values of effective magnetization and cubic anisotropy have been determined from a detailed study of the FMR spectra.