| Summary: | 碩士 === 國立成功大學 === 物理學系碩博士班 === 100 === In this study, strain couplings in the SrRuO3 and CoFe2O4 nano-composites were investigated. CoFe2O4 (CFO), which has ferrimagnetism and magnetic anisotropy property, is widely discussed for the application of the magnetostriction-based sensors, while SrRuO3(SRO), which has good electrical and thermal conductivities, is also known for its photostrictive property. When CoFe2O4 and SrRuO3 are synthesized simultaneously, it is easy to form nanopillars structures. In this study, I used Raman spectroscopy to investigate the distortions of SrRuO3-CoFe2O4 nano-composites under external magnetic fields. The crystal structures of SrRuO3 matrix are affected by the deformation of the CoFe2O4 pillars through the magnetostrictive couplings. The variations of Raman phonons of the nano-composites near the Curie temperatures (Tc) of SrRuO3 and CoFe2O4 were also studied by temperature-dependent Raman measurements. Finally, under the light illumination, the reorientation of magnetic moments in CoFe2O4 nanopillars arising from the photostrictive properties of SrRuO3 were demonstrated by magnetic force microscopy (MFM).
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