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Effect of surface inhomogeneities on crystalline structure and magnetic properties of epitaxial Pr0.7Sr0.3MnO3/La0.5Ca0.5MnO3 film on (001) SrTiO3

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Abstract

Epitaxil Pr0.7Sr0.3MnO3/La0.5Ca0.5MnO3 (PSMO/LCMO) bilayer structure was grown on (001)-oriented SrTiO3 (STO) substrate by pulsed laser deposition. High-resolution synchrotron X-ray diffraction showed high quality of epitaxial layer. However, besides diffraction peaks from PSMO layer, LCMO layer and STO substrate, we observed an additional shoulder peak, which might stem from the inhomogeneities of composition in the film. Grazing incidence X-ray reflectivity (GIXRR) was employed to investigate the surface and interfacial crystalline structure of PSMO/LCMO. The fitting results of GIXRR indicated negligible interdiffusion and roughness at interface. Further atomic force microscopy measurement showed the presence of non-stoichiometric large particulates at surface, imparting an overall inhomogeneous composition to the film. This implied that the variation of crystalline structure of PSMO/LCMO film occurred due to inhomogeneous composition. Moreover, studies on magnetic properties showed that surface inhomogeneities and ferromagnetic clusters at the PSMO/LCMO interface probably influenced the ferromagnetism of the bilayer film together, tuning exchange bias in the film.

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Acknowledgments

This work was supported by Zhejiang Provincial Natural Science Foundation of China (Grant No. LQ14E010005) and the National Natural Science Foundation of China (Grant Nos. 11079022, 51271093, 10904071, U1332106) and the Scientific Research Foundation of Hangzhou Dianzi University (Grant No KYS205614013). We would like to thank colleagues from Shanghai Synchrotron Radiation Facility (SSRF) and Beijing Synchrotron Radiation Facility (BSRF) for their help in XRD experiments.

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Authors and Affiliations

  1. Institute of Materials Physics, Hangzhou Dianzi University, Hangzhou, 310018, China

    H. O. Wang, K. P. Su, Y. Q. Cao, L. W. Li & D. X. Huo

  2. Key Laboratory of Soft Chemistry and Functional Materials, Ministry of Education, Department of Applied Physics, Nanjing University of Science and Technology, Nanjing, 210094, China

    H. O. Wang & W. S. Tan

  3. School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China

    F. Xu

  4. Institute of High Energy Physics, The Chinese Academy of Sciences, Beijing, 100039, China

    Q. J. Jia

  5. Department of Physics, The University of Hong Kong, Hong Kong, China

    J. Gao

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  1. H. O. Wang
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Wang, H.O., Su, K.P., Cao, Y.Q. et al. Effect of surface inhomogeneities on crystalline structure and magnetic properties of epitaxial Pr0.7Sr0.3MnO3/La0.5Ca0.5MnO3 film on (001) SrTiO3 . Appl. Phys. A 119, 609–614 (2015). https://doi.org/10.1007/s00339-015-8999-1

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  • DOI: https://doi.org/10.1007/s00339-015-8999-1

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