Simultaneous control of ferromagnetism and ferroelasticity by oxygen octahedral backbone stretching  

作　　者：Genhao Liang Hui Cao Long Cheng Junkun Zha Mingrui Bao Fei Ye Hua Zhou Aidi Zhao Xiaofang Zhai 梁根豪;曹慧;成龙;查君坤;保明睿;叶飞;周华;赵爱迪;翟晓芳(Department of Physics,University of Science and Technology of China,Hefei 230026,China;School of Physical Science and Technology,ShanghaiTech University,Shanghai 201210,China;Materials Science Division,Argonne National Laboratory,Lemont,IL 60439,USA;X-ray Science Division,Advanced Photon Source,Argonne National Laboratory,Lemont,IL 60439,USA)

机构地区：[1]Department of Physics,University of Science and Technology of China,Hefei 230026,China [2]School of Physical Science and Technology,ShanghaiTech University,Shanghai 201210,China [3]Materials Science Division,Argonne National Laboratory,Lemont,IL 60439,USA [4]X-ray Science Division,Advanced Photon Source,Argonne National Laboratory,Lemont,IL 60439,USA

出　　处：《Chinese Physics B》2024年第9期186-192,共7页中国物理B（英文版）

基　　金：the National Natural Science Foun-dation of China(Grant Nos.52072244 and 12104305);the Science and Technology Commission of Shanghai Municipal-ity(Grant No.21JC1405000);the ShanghaiTech Startup Fund.This research used resources of the Advanced Photon Source,a U.S.Department of Energy(DOE)Office of Sci-ence User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No.DE-AC02-06CH11357.

摘　　要：Coexistence of ferromagnetism and ferroelasticity in a single material is an intriguing phenomenon,but has been rarely found.Here we studied both the ferromagnetism and ferroelasticity in a group of LaCoO3 films with systematically tuned atomic structures.We found that all films exhibit ferroelastic domains with four-fold symmetry and the larger domain size(higher elasticity)is always accompanied by stronger ferromagnetism.We performed synchrotron x-ray diffraction studies to investigate the backbone structure of the CoO6 octahedra,and found that both the ferromagnetism and the elasticity are simultaneously enhanced when the in-plane Co–O–Co bond angles are straightened.Therefore the study demonstrates the inextricable correlation between the ferromagnetism and ferroelasticity mediated through the octahedral backbone structure,which may open up new possibilities to develop multifunctional materials.

关 键 词：perovskite oxide film FERROMAGNETISM FERROELASTICITY twin domain 

分 类 号：O469[理学—凝聚态物理]