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Laser synthesis of thin MnxSi1-x films (x ~ 0.5) on c- and r-Al2O3 substrates at different laser energy densities at the target

Author

Listed:
  • Novodvorsky, Oleg
  • Parshina, Liubov
  • Khramova, Olga
  • Gusev, Dmitriy
  • Drovosekov, Alexey
  • Barkalova, Anastasia
  • Mikhalevsky, Vladimir
  • Cherebilo, Elena
  • Rylkov, Vladimir

Abstract

Thin films of MnxSi1-x (x ~ 0.5) were obtained by pulsed laser deposition in droplet-free mode on c- and r-Al2O3 substrates at different laser energy densities E at the target. Their structural, electrical, and magnetic properties were studied depending on the value of E and the orientation of the substrate. The films are X-ray amorphous on the substrates of both types at E < 6.8 J/cm2, and only at E ≅ 6.8 J/cm2 the reflections of ε-MnSi crystallites with B20-type of structure begin to appear in the MnxSi1-x films on c-Al2O3 and at E ≅ 7.4 J/cm2 - on r-Al2O3 substrates. The X-ray diffraction data of the samples indicate the presence in the films of the ε-MnSi nanocrystallites of an optimal size for the manifestation of high-temperature ferromagnetism; the concentration of nanocrystallites is controlled by the type of substrate and the energy density at the target. It is found that at E > 5.5 J/cm2 the high-temperature ferromagnetic phase shows in the films, and at E ≅ 4 - 5 J/cm2, the low-temperature ferromagnetic phase predominates and there is no influence of the sapphire substrate orientation. The highest Curie temperature TC reached was 330 K at E ≅ 7.4 J/cm2 for the MnxSi1-x films obtained on c- and r-Al2O3. The correlated behavior of the magnetization and the signal of diffuse X-ray radiation scattering confirms the existence of ε-MnSi nanocrystallites.

Suggested Citation

  • Novodvorsky, Oleg & Parshina, Liubov & Khramova, Olga & Gusev, Dmitriy & Drovosekov, Alexey & Barkalova, Anastasia & Mikhalevsky, Vladimir & Cherebilo, Elena & Rylkov, Vladimir, 2021. "Laser synthesis of thin MnxSi1-x films (x ~ 0.5) on c- and r-Al2O3 substrates at different laser energy densities at the target," Chaos, Solitons & Fractals, Elsevier, vol. 142(C).
    • Handle: RePEc:eee:chsofr:v:142:y:2021:i:c:s0960077920308493
    DOI: 10.1016/j.chaos.2020.110457
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    References listed on IDEAS

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    1. X.Z. Yu & N. Kanazawa & W.Z. Zhang & T. Nagai & T. Hara & K. Kimoto & Y. Matsui & Y. Onose & Y. Tokura, 2012. "Skyrmion flow near room temperature in an ultralow current density," Nature Communications, Nature, vol. 3(1), pages 1-6, January.
    2. S. Caprara & E. Kulatov & V.V. Tugushev, 2012. "Half-metallic spin polarized electron states in the chimney-ladder higher manganese silicides MnSi 1−x (x = 1.75 − 1.73) with silicon vacancies," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 85(5), pages 1-12, May.
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    1. Parshina, Liubov & Novodvorsky, Oleg & Khramova, Olga & Gusev, Dmitriy & Polyakov, Alexander & Cherebilo, Elena, 2022. "Tuning the resistive switching in tantalum oxide-based memristors by oxygen pressure during low temperature laser synthesis," Chaos, Solitons & Fractals, Elsevier, vol. 161(C).

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