La_(1-x)Ca_xMnO_3薄膜的制备及结构和磁性研究  

Preparation,Structure and Magnetic Properties of La_(1-x)Ca_xMnO_3 Film

作　　者：陈蕊[1] 张伯军[1] 刘宇[1] 李海波[1] 

机构地区：[1]吉林师范大学凝聚态物理与材料科学研究所,吉林四平136000

出　　处：《吉林师范大学学报（自然科学版）》2010年第2期29-32,共4页Journal of Jilin Normal University:Natural Science Edition

基　　金：吉林省科技发展计划项目(20090144)

摘　　要：采用溶胶-凝胶旋涂法在表面氧化的Si(100)基片上制备了La1-xCaxMnO3(x=0,0.1,0.15)薄膜.利用X射线衍射(XRD)、原子力显微镜(AFM)、扫描电镜(SEM)及振动样品磁强计(VSM)对样品的结构、形貌和磁性进行了研究.结果表明:薄膜为正交钙钛矿结构,具有平整的表面,La0.85Ca0.15MnO3样品的薄膜厚度为334nm.样品在居里温度附近发生铁磁-顺磁转变,随着Ca2+掺杂浓度的增加,样品的居里温度变大,x=0.15时,样品的居里温度为299K.La1-xCaxMnO3（x=0,0.1,0.15） films were prepared on Si（100） crystal substrate with the surface oxide layer by sol-gel spin-coating method.The structure,surface topography and magnetic properties were characterized by X-ray diffractometer（XRD）,atom force microscope（AFM） and vibrating sample magnetometer（VSM）.The results show that the thin films were an orthorhombic structure with smooth surface,and the thickness of La0.85Ca0.15MnO3 film was 334 nm.There was a transition from ferromagnetism to paramagnetism near Curie temperature.The Curie temperature of the samples increased with the increase of the concentration of Ca^2＋ ion.The Curie temperature was 299 K for the samples with x=0.15.

关 键 词：La1-xCaxMnO3薄膜 溶胶-凝胶旋涂法 结构 磁性 

分 类 号：O482.5[理学—固体物理]