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Influence of Layer-Thickness Ratio on Magnetic Properties in F-La2/3Ca1/3MnO3/AF-La1/3Ca2/3MnO3 Bilayers

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Abstract

Magnetic properties were investigated in ferromagnetic/antiferromagnetic bilayers based on a Ca-doped lanthanum manganite system via hysteretic loops, La1−x Ca x MnO3 grown in situ on (001) oriented SrTiO3 crystalline substrates by using a dc sputtering technique at high-pressure (3.5 mbar) pure oxygen as sputter gas and at a substrate temperature of 850 ∘C. We grew the antiferromagnetic layer La1/3Ca2/3MnO3 (AF-LCMO) with a given thickness, t AF, and the ferromagnetic layer La2/3Ca1/3MnO3 (F-LCMO) with a given thickness, t F. We produced two series of samples: the first one with thickness ratio, t F/t AF, of 1/6 and 6/1, maintaining constant the total thickness of the bilayer to 70 nm, and the second one with t F/t AF of 3/25, 9/25, 15/25, maintaining constant the antiferromagnetic thickness to 25 nm. Magnetization versus applied field loop was strongly dependent on the t F/t AF ratio, which was influenced by both the strains presented in very thin films originated during the growth of the bilayer and the magnetic moment interaction at the ferromagnetic/antiferromagnetic interface due to changes of the electronic structure in this strongly correlated system.

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Acknowledgements

This work is partially supported by “El Patrimonio Autónomo Fondo Nacional de Financiamiento para la Ciencia, la Tecnología y la Innovación Francisco José de Caldas” Contract RC-No. 275-2011. L. Marín thanks Instituto de Nanociencias de Aragón, Universidad de Zaragoza, PIF-UZ-2009-CIE-02, Spain.

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Authors and Affiliations

  1. Thin Film Research Group, Department of Physics, Universidad del Valle, Cali, Colombia

    P. Prieto, S. M. Diez & M. E. Gómez

  2. Instituto de Nanociencia de Aragón, Universidad de Zaragoza, Zaragoza, Spain

    L. Marín

  3. Department of Physics, Universidad de los Andes, Bogotá, Colombia

    J.-G. Ramirez

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  1. P. Prieto
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  2. L. Marín
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  3. S. M. Diez
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  4. J.-G. Ramirez
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  5. M. E. Gómez
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Correspondence to S. M. Diez.

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Prieto, P., Marín, L., Diez, S.M. et al. Influence of Layer-Thickness Ratio on Magnetic Properties in F-La2/3Ca1/3MnO3/AF-La1/3Ca2/3MnO3 Bilayers. J Supercond Nov Magn 25, 2193–2198 (2012). https://doi.org/10.1007/s10948-012-1648-4

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  • DOI: https://doi.org/10.1007/s10948-012-1648-4

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