| Summary: | 碩士 === 國立成功大學 === 材料科學及工程學系碩博士班 === 90 === Many researches indicate that the electric and magnetic properties of the La-Sr-Mn-O film were strongly depend on substrate due to the lattice matching condition. In this work, La-Sr-Mn-O film have be deposited on small lattice mismatch substrates, (100) LaAlO3, single and bicrystal (001)YBaCuO by rf-sputtering. Then we do the XRD, SEM, AFM and TEM analysis to discuss the annealing and grain boundary effect on crystal structure and magnetoresistive properties.
It is observed that the films grown on LAO and YBCO have high prefer orientation, and the crystallinity and MR% of the films increase after annealing. Some rectangular crystalline structures appear when the LSMO/YBCO anneal at 900℃. For the films grown on bi-crystal YBCO substrates with different mis-orientation angle, inter-grain MR% increases with increasing the angle of grain boundary.
|
|---|
