Dresden 2009 – wissenschaftliches Programm

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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 40.40: Poster

Freitag, 27. März 2009, 11:00–14:00, P1A

The effect of oxygen nonstoichiometry on (Sr/La)2FeMoO6-d double perovskite — •Mikalai Kalanda¹, Anis Saad², Sergey Demyanov¹, and Alexander Petrov¹ — ¹Scientific-Practical Materials Research Centre NAS of Belarus, Minsk, Belarus — ²Al-Balqua Applied University, Salt, Jordan

Layered magnetic semiconductors Sr2FeMoO6-d could be considered among the most prospective materials for spintronics. In this work we investigate synthesis of (Sr/La)2FeMoO6-d using semi-reduced precursors SrFeO3-x, SrMoO4-x as initial reagents. It is established that the temperature dependence of magnetization is determinedby the oxygen index and external magnetic field values. in dependence on oxygen index and external magnetic field. For the (Sr/La)2FeMoO6.00 compound during cooling from 300 K down to 170 K magnetization goes up and then decreases and magnetization at 77 K almost reaches the values of magnetization at 300 K. At the increase of the measured magnetic field up to 1 T magnetization of (Sr/La)2FeMoO6.00 constantly grows at 300 - 77 K. It is supposed that the presence of point defect influence the exchange interactions mechanism, changing ferromagnetic interaction in the Fe3+ - O - Mo5 chains to (Sr/La)2FeMoO5.87 to the ferromagnetic one for (Sr/La)2FeMoO6.00 at 300 - 170 K between iron cations with a subsequent appearance of ferromagnetic exchange interaction lower than 170 K.