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摘要
We report the synthesis of nanostructured Sr2FeMoO6 (SFMO) thin films on SrTiO3 (0 0 1), LaAlO3 (0 0 1) and MgO (0 0 1) substrates by pulsed laser deposition technique. The influence of substrate nature on structural and magnetic properties of thin films has been systematically investigated. The films deposited on SrTiO3 and LaAlO3 were single crystalline with preferred (0 0 4) orientation without any impurity peak, whereas the films deposited on MgO substrate exhibit impurity peaks of SrFeO3 along with (0 0 4) reflection of SFMO. The out of plane lattice parameter, 'c' and grain size have been shown to be influenced by nature of substrate. Further, the magnetic properties of the films, including the coercive field, remnant magnetization, saturation magnetization and magnetoresistance were also observed to be strongly dependent on the choice of substrate. The investigations reveal an increase in magnetization with decrease in film-substrate lattice mismatch. The films on SrTiO3 substrate exhibit a saturation magnetic moment of 3.24 mu(B)/f.u. at 5 K, with a Curie temperature larger than 320K, whereas the films deposited on MgO substrate are observed to have low magnetization, which is related to the high proportion of antisite defects in these films. The magnitude of MR was observed to be smaller in case of films deposited on SrTiO3 substrate and in addition the variation in MR with applied field was found to be linear in these films, whereas the films on MgO substrate were found to exhibit higher value of MR with two different regimes: the low-field region (H < 20 kOe) with a steeper slope and the high-field behavior with a less pronounced slope. The present study elucidates the effects of substrate nature on magnetization and that the magnetoresistance behavior of SFMO thin films are useful in magnetic sensors and spintronics application.
- 出版日期2010-8-15
