Room temperature ferromagnetism of nonmagnetic element Ca-doped LiNbO_3 films  

作　　者：刘华蕊 李敏 孙鹏 王诗琪 金鑫 孙现科 安玉凯 刘技文 

机构地区：[1]Tianjin Key Laboratory for Photoelectric Materials and Devices, School of Material Science and Engineering, Tianjin University of Technology

出　　处：《Optoelectronics Letters》2014年第2期115-118,共4页光电子快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.11174217 and 10904110)

摘　　要：The nonmagnetic element Ca-doped LiNbO3 films were prepared on Si(111) substrates by radio frequency(RF) magnetron sputtering technique. X-ray diffraction(XRD) and X-ray photoelectron spectroscopy(XPS) indicate that the Ca atoms enter the LiNbO3 lattice in the form of Ca2+ ions. Superconducting quantum interference device(SQUID) results show that the Ca-doped LiNbO3 films have room-temperature ferromagnetism and a maximum saturation magnetization of 4800 A/m at the 3% of Ca atom doping concentration. The room temperature ferromagnetism of the Ca-doped LiNbO3 films can be attributed to the occurrence of vacancies due to Ca doping and is the intrinsic property.The nonmagnetic element Ca-doped LiNbO3 films were prepared on Si （111） substrates by radio frequency （RF） mag- netron sputtering technique. X-ray diffraction （XRD） and X-ray photoelectron spectroscopy （XPS） indicate that the Ca atoms enter the LiNbO_3 lattice in the form of Ca^2＋ ions. Superconducting quantum interference device （SQUID） resuits show that the Ca-doped LiNbO_3 films have room-temperature ferromagnetism and a maximum saturation magnetization of 4800 A/m at the 3% of Ca atom doping concentration. The room temperature ferromagnetism of the Ca-doped LiNbO_3 films can be attributed to the occurrence of vacancies due to Ca doping and is the intrinsic property.

关 键 词：铌酸锂薄膜 钙掺杂 铁磁性 非磁性 室温 元素 SI(111)衬底 LiNbO3薄膜 

分 类 号：TM271[一般工业技术—材料科学与工程]