Abstract
La0.67Sr0.33MnOz (LSMO) thin films were synthesized by means of metal-organic decomposition on the substrates including amorphous quartz, (100) Si chip, (100) MgO single crystal and polycrystalline Al2O3 ceramic plate. The structure and magnetotransport properties of the films were characterized. X-ray diffraction spectra show that all samples are polycrystalline with (202) preferred orientation. All films present metal–insulator transition and enhanced magnetoresistance (MR) effect below metal–insulator transition peak temperature (Tp). At room temperature (RT) low-field magnetoresistance effect (LFMR) and linear change of resistivity under applied field are exhibited by all the films. These magnetotransport properties were first ascribed to the porous structural characteristics in the films observed by atomic force microscope. Furthermore, the LSMO film synthesized on (100) MgO substrate presents a bit different magnetic properties and magnetotransport from the other samples, including broad ferromagnetic–paramagnetic transition zone, lower Tp and weaker LFMR at RT. However, for the samples synthesized on the other substrates, the LFMR effect is very similar to each other and their MR ratio reaches near 5% under 10kOe field. Thus the substrate effect of LSMO film on (100) MgO is more intensive than that of the other samples.
Published Version
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