La_(0.7)Sr_(0.3)MnO_3/La_(0.7)Sr_(0.3)CoO_3超晶格中团簇玻璃态诱导的矫顽力增强  

CLUSTER-GLASS-STATEINDUCED COERCIVITY ENHANCEMENT IN La_(0.67)Sr_(0.33)MnO_3/La_(0.67)Sr_(0.33)CoO_3 SUPERLATTICES

作　　者：王怡[1] 王凌飞[1] 吴文彬[1] 

机构地区：[1]合肥微尺度物质科学国家实验室,中国科学技术大学,合肥230026

出　　处：《低温物理学报》2013年第5期339-344,共6页Low Temperature Physical Letters

基　　金：国家自然科学基金项目(批准号:11074237;11274287)资助的课题~~

摘　　要：本文利用脉冲激光沉积方法制备出由铁磁材料La0.7Sr0.3MnO3和团簇玻璃材料La0.7Sr0.3CoO3构成的高质量外延超晶格.在这一超晶格体系中,当La0.7Sr0.3CoO3层在低温表现出团簇玻璃态行为时,La0.7Sr0.3MnO3层则表现出明显的矫顽力增强,特别是在温度降至5K时,其矫顽场相对单层膜增加了近16倍.我们认为这一矫顽力的增强效应来源于La0.7Sr0.3MnO3中的长程铁磁序与La0.7Sr0.3CoO3层的团簇玻璃态在界面处强烈的磁交换耦合.We prepare ferromagnetic La0. 67Sr0. 33MNO3/clusters glassLa0. 67Sr0. 33CoO3 superlattice with a high epitaxial quality by using pulsed laser deposition. In this system, apparent coercive field enhancement will appear in La0. 67Sr0. 33MNO3 layer, while La0. 67Sr0. 33CoO3 layer cially at 5K the coercive field is almost 16 times lager hancement phenomenon is mainly determined by the and La0. 67Sr0. 33CoO3, shows clusters glass behavior in low temperature range, espe-than the monolayer. The results indicate that the coercivity en- strong interfacial magnetic coupling between La0. 67Sr0. 33MNO3.

关 键 词：超晶格 矫顽力增强 脉冲激光沉积 

分 类 号：TM271[一般工业技术—材料科学与工程]