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MA: Magnetismus

MA 20: Poster:Schichten(1-29),Spintrsp(30-45),Ex-Bias(46-63),Spindyn(64-75),Mikromat.(76-80),Cluster(81-94),Abbv.(95-99),Obflm(100-02),SpElek.(103-09),E-Theo(110-14),Mikromag.(115-16),Spin+PÜ(117-26),Mag.Mat.(127-51),Meth.(152-55),Mol.Mag(156-59),Kondo(160-65

MA 20.28: Poster

Monday, March 7, 2005, 14:00–18:00, Poster TU C

Properties of thin LaMnO₃ layers and its characterization as a tunneling barrier — •Andreas Kleine, Yuansu Luo, Markus Esseling, and Konrad Samwer — I. Physikalisches Institut, Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen

The effort of preparing a full-oxid all-manganite TMR system motivates the characterization of thin LaMnO₃ (LMO) layers as a tunneling barrier. Good magnetic and electronic properties are expected due to the conservation of symmetry at the interface. Below the Neel temperature of 140K stochiometric LaMnO_3+δ is a canted antiferromagnetic insulator with a small magnetic moment. The excess oxygen δ in LaMnO_3+δ mainly changes the electronic and magnetic properties, which are to be optimized. Structural, magnetic and electronic properties of DC-magnetron sputtered LMO layers are presented in dependency of the oxygen excess. Moreover the results of tunneling contacts with LMO barrier and its dependency on the preparation parameters and barrier thickness, as well as the property changes due to annealing, will be shown and discussed.

This work was supported by the DFG Sa 337/9-1.