摘要
Rare earth orthoferrites(RFeO3,R=Y,Gd,Sm,Nd)have recently attracted much attention due to their novel magnetic and electrical properties such as magneto-electrics,magneto-dielectrics.and magneto-optics[1-3].The complex interactions between the two sublattices of R^3+and Fe^3+in RFeO3 provide the feasibility of control-ling spins in these solids,which makes them promising candidates for the spintronics[4].
为满足实际应用,自旋电子学器件需要自旋在特定方向发生自发取向,但这通常是难以控制的.在本文中,我们观察了沿b轴的单晶Gd(0.75)La(0.25)FeO3在室温下伴随着弱铁磁(w FM)成分的反铁磁(AFM)磁有序.与普通的AFM材料不同,这里的w FM磁矩是离散的,类似于二维量子阱,可以通过一个小磁场在两个状态之间切换.量子阱中的势垒使得矫顽力在50–350 K的宽温度范围内保持稳定,并在17 K时产生独特的自旋翻转现象.此外,在RFeO3(R=稀土)中,稀土和铁的次晶格之间普遍存在着一种AFM耦合.而在Gd(0.75)La(0.25)-FeO3中,Gd与Fe次晶格之间的AFM耦合被破坏,使得Gd被诱导出的磁矩与Fe磁矩方向不再相反,而是表现出与Fe磁矩方向相同的诱导磁矩.由于在GdFeO3或LaFeO3中不存在自旋翻转,因此AFM耦合的破坏也被认为是材料表现出一种独特的自旋翻转现象的主要原因.以上性质使得Gd(0.75)La(0.25)FeO3在信息存储方面具有更优良的可控性.
作者
Xin Wen
Zhigang Song
Iftikhar Ahmed Malik
Yifei Fang
Wenyun Yang
Jingzhi Han
Shunquan Liu
Honglin Du
Shixun Cao
Jinxing Zhang
Xiangqun Zhang
Zhaohua Cheng
Yanglong Hou
Jinbo Yang
闻馨;宋志刚;Iftikhar Ahmed Malik;方依霏;杨文云;韩景智;刘顺荃;杜红林;曹世勋;张金星;张向群;成昭华;侯仰龙;杨金波(State Key Laboratory for Mesoscopic Physics and School of Physics,Peking University,Beijing,100871,China;Department of Physics,Beijing Normal University,Beijing,100875,China;Department of Physics,Fudan University,Shanghai,200433,China;Beijing Key Laboratory for Magnetoelectric Materials and Devices,Beijing,100871,China;Department of Physics,Shanghai University,Shanghai,200444,China;State Key Laboratory of Magnetism,Institute of Physics,Chinese Academy of Sciences,Beijing,100080,China;Department of Materials Science and Engineering,College of Engineering,Peking University,Beijing,100871,China)
基金
the National Key Research and Development Program of China(2016YFB0700901,2017YFA0206303,2017YFA0206301 and 2017YFA0403701)
the National Natural Science Foundation of China(51731001,11675006 and11805006)。
