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Synthesis of Ferromagnetic Alloys Semiconductor–Ferromagnet in the CdAs2–MnAs System

  • PHYSICOCHEMICAL ANALYSIS OF INORGANIC SYSTEMS
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Abstract

Semiconductor–ferromagnet alloys in the CdAs2–MnAs system were synthesized in evacuated ampules. Differential thermal analysis (DTA), X-ray powder diffraction analysis, differential scanning calorimetry, and scanning electron microscopy showed that this system is eutectic (of the acicular type), and the coordinates of the eutectic are (6 ± 0.5 mol % MnAs, Tmelt = 614 ± 1°C). The liquidus lines constructed based on the thermal events of melting in DTA are 40–50°C higher than the lines constructed based on the thermal events of crystallization, which is due to the tendency of CdAs2 toward glass transition. The synthesized alloys are ferromagnetic with TC = 315 K, and the magnetization of them increases with increasing MnAs content. The alloys with nanoinclusions ≤40 nm of the ferromagnetic phase MnAs were produced by crystallization from melts at high cooling rates (≤100 deg/s). They have a higher Curie temperature of TC = 353 K and a negative magnetoresistance of ΔR = 2% at 300 K in a saturation magnetic field of 4500 Oe, which is of practical interest for creating magnetic granular spintronic structures.

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Funding

This work was carried out within the State Assignment on Fundamental Research to the Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, and supported in part by the Presidium of the Russian Academy of Sciences, program no 15.1: Scientific Principles of Producing Novel Functional Materials.

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Authors and Affiliations

  1. Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, 119991, Moscow, Russia

    S. F. Marenkin, A. I. Ril’ & I. V. Fedorchenko

  2. National University of Science and Technology “MISiS”, 119991, Moscow, Russia

    S. F. Marenkin

  3. Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, 119991, Moscow, Russia

    V. V. Kozlov

Authors
  1. S. F. Marenkin
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  2. A. I. Ril’
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  3. I. V. Fedorchenko
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  4. V. V. Kozlov
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Correspondence to A. I. Ril’.

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Translated by V. Glyanchenko

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Marenkin, S.F., Ril’, A.I., Fedorchenko, I.V. et al. Synthesis of Ferromagnetic Alloys Semiconductor–Ferromagnet in the CdAs2–MnAs System. Russ. J. Inorg. Chem. 65, 1219–1225 (2020). https://doi.org/10.1134/S0036023620080112

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