A new high-temperature perovskite-like magnetic insulator  

一种新型高温类钙钛矿磁性绝缘体

作　　者：Haowen Tang Zezhi Chen Jianlin Wang Haoliang Huang Jun Huang Zhengping Fu Ranran Peng Yalin Lu 唐浩文;陈泽志;王建林;黄浩亮;黄俊;傅正平;彭冉冉;陆亚林(Hefei National Laboratory for Physical Sciences at Microscale,University of Science and Technology of China,Hefei 230026,China;CAS Key Laboratory of Materials for Energy Conversion,Department of Materials Science and Engineering,University of Science and Technology of China,Hefei 230026,China;Synergetic Innovation Center of Quantum Information&Quantum Physics,University of Science and Technology of China,Hefei 230026,China)

机构地区：[1]Hefei National Laboratory for Physical Sciences at Microscale,University of Science and Technology of China,Hefei 230026,China [2]CAS Key Laboratory of Materials for Energy Conversion,Department of Materials Science and Engineering,University of Science and Technology of China,Hefei 230026,China [3]Synergetic Innovation Center of Quantum Information&Quantum Physics,University of Science and Technology of China,Hefei 230026,China

出　　处：《Science China Materials》2020年第7期1330-1336,共7页中国科学（材料科学（英文版）

基　　金：supported by the National Key R&D Program of China(2016YFA0401004);the Chinese Universities Scientific Fund(CUSF,WK2310000055);the External Cooperation Program of BIC(Chinese Academy of Sciences,211134KYSB20130017)。

摘　　要：Driven by the demands of fast-developed quantum-spintronic devices and magnetic tunneling junctions,exploring excellent magnetic insulators,which can func-tion above room temperature and have high symmetry(generally speaking perovskite or perovskite-like struc-ture)to facilitate their integration potential with common single crystal oxide films or substrates as further devices,have drawn special attentions[1-4].Unfortunately.寻找一种性能良好的磁性绝缘材料是发展新型多功能量子自旋电子器件至关重要的基础,但是大多数已知的磁性绝缘材料具有居里温度低(<300 K),铁磁性和结构对称性差的特点.本工作中,我们成功设计并制备了一种新型的磁性绝缘体:Bi8Fe2.8Co0.2-Ti2O20Cl,它具有包含五层钙钛矿层的层状Sillen-Aurivillius结构.令人惊讶的是,此种化合物的居里温度达到了约804 K,比未掺杂的奈耳温度提高超过300 K.此外,由于Sillen层的存在,Bi8Fe2.8-Co0.2Ti2O20Cl具有比所有已知相同Co摩尔比掺杂的Aurivillius氧化物更大的剩余磁化强度.X射线吸收光谱(XAS)和X-光磁性圆二色性(XMCD)光谱分析表明,Bi8Fe2.8Co0.2Ti2O20Cl的铁磁性主要是由Co掺杂引起的FeO6八面体的形变和Fe-O-Co的DzyaloshinskiiMoriya(D-M)相互作用所致.

关 键 词：居里温度 绝缘材料 剩余磁化强度 绝缘体 类钙钛矿 结构对称性 八面体 圆二色性 

分 类 号：TM21[一般工业技术—材料科学与工程]