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Coercivity mechanisms in nanocrystalline Sm–Co–Cu thin films: the spring effect

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Abstract

In magnetron sputtering, with the simultaneous deposition of SmCo and copper, it is possible for tailoring the coercive field of SmCoCu thin films. Microstructural analysis pointed out that nanocrystalline 2:17 rhombohedral phase with diameter 10–100 nm was obtained, and coercivities in the range between 3 and 8.5 kOe. These characteristics are suitable for magnetic recording. The coercivity mechanisms are discussed. The initial magnetization curve, measured in thermally demagnetized samples, is used to discuss the coercivity mechanisms. A spring effect in the samples is observed. The spring effect is due to reversible rotation of magnetization and indicates that the coercivity mechanism is nucleation or coherent rotation of single domain size nanoscale grains. Structural data refined with X-ray diffraction Rietveld analysis for Sm2(Co,Cu)17 rhombohedral phase, Sm(Co,Cu)5 phase and cubic oxide Sm2O3 phase are provided.

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FAPERJ, CNPq.

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Authors and Affiliations

  1. Physics Institute of University of São Paulo, São Paulo, SP, Brazil

    Sergio Antonio Romero, Tarsis Germano & Renato Cohen

  2. Department of Metallurgy and Materials, Polytechnic School of the University of São Paulo, São Paulo, SP, Brazil

    Daniel Rodrigues Jr

  3. Federal Fluminense University, Volta Redonda, RJ, Brazil

    Jose´Adilson de Castro & Marcos Flavio de Campos

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  1. Sergio Antonio Romero
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Romero, S.A., Rodrigues, D., Germano, T. et al. Coercivity mechanisms in nanocrystalline Sm–Co–Cu thin films: the spring effect. Appl Nanosci 13, 6353–6372 (2023). https://doi.org/10.1007/s13204-023-02931-1

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