Tuning the magnetic anisotropy in LSMO manganite films through non-magnetic nanoparticles

作     者：Yuze Gao Jincang Zhang Xinwen Fu Guixin Cao Hanns-Ulrich Habermeier 

作者机构：Max Planck Institute for Solid State Research Department of Physics Shanghai University Department of Materials Science and Engineering University of Tennessee Materials Science and Technology Division Oak Ridge National Laboratory 

出 版 物：《Progress in Natural Science:Materials International》 (自然科学进展·国际材料(英文))

年 卷 期：2013年第23卷第2期

页      面：127-132页

核心收录：

学科分类：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 National Natural Science Foundation of China (Nos. 10804068 and 10774097) 

主　　题：Kondo-like effect Magnetic domains Biaxial epitaxial strain Anisotropic magnetic hysteresis Non-magnetic nano-scaled precipitates 

摘      要：We report the observation of anomalous magnetic anisotropy driven by nonmagnetic ZrO2 nanoparticles in epitaxial La2/3Sr1/3MnO (LSMO) films grown on LaAlO3 (LAO) substrates. The compressive epitaxial strain imposed by the lattice mismatch of substrate and film is tuned by the density of ZrO2 nanoparticles embedded in the film matrix and affects the magnetic anisotropy as well as the magnetotransport properties. Epitaxial 54 nm thick LSMO thin films with different concentrations of ZrO2 nanoparticles demonstrate anisotropic hysteresis loops concomitant with anisotropic magnetotresistance behavior. The biaxial epitaxial strain, induced by the substrate/film lattice parameter mismatch is partially relaxed by increasing the density of precipitates and they serve as a tuning parameter for the strain state. We interpret our results by a strain-induced interplay of impurity scattering, weak localization and magnetic domain structure.