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

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

Chaos, Solitons & Fractals, 2021, vol. 142, issue C

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.

Keywords: Pulsed laser deposition; Thin films; Ferromagnetic materials; Non-stoichiometric MnxSi1-x alloys (search for similar items in EconPapers)
Date: 2021
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Persistent link: https://EconPapers.repec.org/RePEc:eee:chsofr:v:142:y:2021:i:c:s0960077920308493

DOI: 10.1016/j.chaos.2020.110457

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