Magnetic Interactions with Strain Gradient in Ultrathin Pr_(0.67)Sr_(0.33)MnO_(3) Films  

作　　者：Bangmin Zhang Ping Yang Jun Ding Jingsheng Chen Gan Moog Chow 

机构地区：[1]Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices,School of Physics,Sun Yat-sen University,Guangzhou 510275,China [2]Singapore Synchrotron Light Source,National University of Singapore,Singapore 117603,Singapore [3]Department of Materials Science and Engineering,National University of Singapore,Singapore 117575,Singapore

出　　处：《Engineering》2024年第9期158-165,共8页工程（英文）

基　　金：supported by the Natural Science Foundation of Guangdong Province of China(2023A1515010882);the Large Scientific Facility Open Subject of Songshan Lake,Dongguan,Guangdong Province of China(KFKT2022B06);the Singapore Ministry of Education Academic Research Fund Tier 2(MOE2015-T2-1-016,MOE2018-T2-1-019,and MoE T1 R-284-000-196-114);the Singapore National Research Foundation(NRF-CRP10-2012-02);supported from SSLS via National University of Singapore Core Support(C-380-003-003-001).

摘　　要：Strain gradient is a normal phenomenon around a heterostructural interface in ultrathin film,and it is important to determine its effect on magnetic interactions to understand interfacial coupling.In this work,ultrathin Pr_(0.67)Sr_(0.33)MnO_(3)(PSMO)films on different substrates are studied.For PSMO film under different in-plane strain conditions,the saturated magnetization and Curie temperature can be qualitatively explained by double-exchange interaction and the Jahn-Teller distortion.However,the difference in the saturated magnetization with zero field cooling and 5 T field cooling is proportional to the strain gradient.Strain-gradient-induced structural disorder is proposed to enhance phonon-electron antiferromagnetic interactions and the corresponding antiferromagnetic-to-ferromagnetic phase transition via a strong magnetic field during the field cooling process.A non-monotonous structural transition of the MnO_(6) octahedral rotation can enlarge the strain gradient in PSMO film on a SrTiO_(3) substrate.This work demonstrates the existence of the flexomagnetic effect in ultrathin manganite film,which should be applicable to other complex oxide systems.

关 键 词：Strain gradient Manganite film Octahedral rotation Flexomagnetic Magnetic interactions Phase transition 

分 类 号：TB383.2[一般工业技术—材料科学与工程]