多铁性BiFeO3薄膜的制备和磁电特性研究.docx

多铁性BiFeO3薄膜的制备和磁电特性研究
摘要
本文研究了多铁性BiFeO3薄膜的制备和磁电特性。采用溶胶凝胶法制备BiFeO3的先驱体材料，并利用射流蒸发沉积技术在Pt/Ti/SiO2/Si衬底上生长BiFeO3薄膜。通过X射线衍射分析、扫描电子显微镜和原子力显微镜等方法，研究了BiFeO3薄膜的微观结构和表面形貌。同时，利用量子电容测量和霍尔效应测量技术，研究了BiFeO3薄膜的磁电特性，包括铁电极化和磁化。
结果表明，通过溶胶凝胶法制备的BiFeO3先驱体具有良好的热稳定性和可溶性，可以用于制备高质量的BiFeO3薄膜。采用射流蒸发沉积技术制备的BiFeO3薄膜具有纯相、均匀和致密的微观结构和表面形貌。磁电特性研究表明，BiFeO3薄膜在室温下表现出铁电极化和磁化的共存。当外加电场施加时，BiFeO3薄膜的极化方向可以被反转。而当外加磁场施加时，BiFeO3薄膜的磁化方向可以被调控。
综上所述，本文研究了多铁性BiFeO3薄膜的制备和磁电特性，并得出了一些有价值的结论，为该材料在电子器件、传感器和存储器等领域的应用提供了理论和实验基础。
关键词：BiFeO3薄膜；制备；表征；磁电特性；射流蒸发沉积
Abstract
Inthispaper,thepreparationandmagnetic-electricpropertiesofmultiferroicBiFeO3thinfilmswerestudied.TheprecursormaterialsofBiFeO3werepreparedbysol-gelmethod,andtheBiFeO3thinfilmsweregrownonPt/Ti/SiO2/Sisubstratesbyjetdepositiontechnique.ThemicrostructureandsurfacemorphologyofBiFeO3thinfilmswerestudiedbyX-raydiffraction,scanningelectronmicroscopyandatomicforcemicroscopy.Inaddition,themagnetic-electricpropertiesofBiFeO3thinfilms,includingferroelectricpolarizationandmagnetization,wereinvestigatedbyquantumcapacitancemeasurementandHalleffectmeasurementtechniques.
TheresultsshowedthattheprecursorofBiFeO3preparedbysol-gelmethodhadgoodthermalstabilityandsolubility,whichcouldbeusedtopreparehigh-qualityBiFeO3thinfilms.TheBiFeO3thinfilmpreparedbyjetdepositiontechniquehadapure,uniformanddensemicrostructureandsurfacemorphology.Thestudyofmagnetic-electricpropertiesshowedthatBiFeO3thinfilmsshowedcoexistenceofferroelectricpolarizationandmagnetizationatroomtemperature.Whenanexternalelectricfieldwasapplied,thepolarizationdirectionofBiFeO3thinfilmcouldbereversed.Whenanexternalmagneticfieldwasapplied,themagnetizationdirectionofBiFeO3thinfilmcouldbecontrolled.
Insummary,thispaperstudiedthepreparationandmagnetic-electricpropertiesofmultiferroicBiFeO3thinfilms,andsomevaluableconclusionsweredrawn,whichprovidedtheoreticalandexperimentalbasisfortheapplicationofthismaterialinelectronicdevices,sensorsandmemories.
Keywords:BiFeO3thinfilms;preparation;characterization;magnetic-electricpro