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

Engineering 2024年第9期40卷 158-165页

作者： Bangmin Zhang Ping Yang Jun Ding Jingsheng Chen Gan Moog Chow Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices School of PhysicsSun Yat-sen UniversityGuangzhou 510275China Singapore Synchrotron Light Source National University of SingaporeSingapore 117603Singapore Department of Materials Science and Engineering National University of SingaporeSingapore 117575Singapore

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 *** this work,ultrathin Pr_(0.67)Sr_(0.33)MnO_(3)(PSMO)films on different substrates are *** 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 ***,the difference in the saturated magnetization with zero field cooling and 5 T field cooling is proportional to the 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) *** 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

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Dependence of the coercivity of La0.67Ca0.33MnO3 films on substrate and thickness

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Chinese Physics B 2005年第3期14卷 604-609页

作者：熊昌民孙继荣王登京刘光娟张宏伟沈保根 BeijingNationalLaboratoryforCondensedMatterPhysics InstituteofPhysicsChineseAcademyofSciencesBeijing100080China

We investigate the effects of strain and film thickness on the coercivity of La0.67Ca0.33MnO3 films grown on SrTiO3 and LaAlO3 substrates. Textured microstructure with the grain [001] pseudo-cubic axis normal to the film surface is obtained. The average grain size decreases with decreasing film thickness t. The magnetic anisotropy depends upon the substrate-induced strain. Firstly, the intrinsic coercivity iHC increases as t varies from 5 nm to 10 nm, then attains a maximum at t～10-25nm. A further increase in t yields a gradual reduction of iHC. By the analysis of the dependence of iHC on the measured direction of magnetic field, the coercivity mechanism is assumed to be mainly determined by the nucleation of reversed domain and the domain wall pining for t≤10nm and t≥25nm, respectively, which were further verified by the investigation of the initial magnetization curves for the LCMO/STO films with t=5, 10, 25 and 400nm, and the minor magnetic loops for the LCMO/LAO films with t=5 and 50nm. Moreover, the size of the inhomogeneous region in which the nucleation or pinning takes place is discussed.

关键词： manganite film thickness magnetic anisotropy coercivity

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