超薄Pr0.67Sr0.33MnO3薄膜中的应变梯度与磁相互作用（英文）

作     者：张帮敏 杨平 丁军 陈景升 Gan Moog Chow 

作者机构：Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices School of Physics Sun Yat-sen University Singapore Synchrotron Light Source National University of Singapore Department of Materials Science and Engineering National University of Singapore 

出 版 物：《Engineering》 (工程(英文))

年 卷 期：2024年第9期

页      面：158-165页

核心收录：

学科分类：07[理学] 070205[理学-凝聚态物理] 08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

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-T2-1016, MOE2018-T2-1-019, and MoE T1 R-284-000-196-114) the Singapore National Research Foundation (NRF-CRP10-201202) 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 Pr0.67Sr0.33MnO3（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 MnO6octahedral rotation can enlarge the strain gradient in PSMO film on a SrTiO3substrate. This work demonstrates the existence of the flexomagnetic effect in ultrathin manganite film, which should be applicable to other complex oxide systems.