Berlin 2012 – wissenschaftliches Programm
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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 52.19: Poster
Freitag, 30. März 2012, 11:00–14:00, Poster A
Investigations of magnetism in multiferroic layer systems — •Martin Welke1, Joachim Gräfe1, Vasili Hari Babu1, Remya Kunjuveettil Govind2, Martin Trautmann2, Francis Bern3, Michael Ziese3, Karl-Michael Schindler2, and Reinhard Denecke1 — 1Wilhelm-Ostwald-Institut für Physikalische und Theoretische Chemie, Universität Leipzig — 2Institut für Physik, Universität Halle — 3Institut für Physik, Universität Leipzig
Systems with multiferroic properties are of interest for research since the 60s of the 20th century. In the starting time single crystal multiferroics were in the focus of research. Nowadays layer systems with ferroelectric and ferromagnetic components are also studied.
The work presented deals with different ferrite layers - namely Nickelferrite and Cobaltferrite - on Bariumtitanate (001). Preparation of the ferrite films was done by PLD in UHV. Subsequently they were measured by SQUID in order to obtain magnetization loops. From temperature-dependend data, there seems to be an influence of the phase transitions of Bariumtitanate on the magnetic response of the ferrite films. Altogether Nickelferrite and Cobaltferrite appear to have a small remanent magnetization.
In order to additionally characterize these materials XPS measurements were carried out. Especially the Iron to Oxygen ratio is of interest.
Furthermore XAS measurements of thick ferrite layers were taken into account.