Volume 259, Issue 11 2200248
Research Article

High-Temperature Ferromagnetism of the Iron-Based FCC Phase: The Effect of Carbon and Nickel

Mikhail A. Uimin

Mikhail A. Uimin

Laboratory of Applied Magnetism, M.N. Mikheev Institute of Metal Physics of UB of RAS, Yekaterinburg, 620108 Russia

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Anatoly Ye. Yermakov

Anatoly Ye. Yermakov

Laboratory of Applied Magnetism, M.N. Mikheev Institute of Metal Physics of UB of RAS, Yekaterinburg, 620108 Russia

Department of Magnetism and Magnetic Nanomaterials, Ural Federal University named after the first President of Russia B. N. Yeltsin, Yekaterinburg, 620002 Russia

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Alexander V. Korolev

Alexander V. Korolev

Laboratory of Ferromagnetic Alloys, M.N. Mikheev Institute of Metal Physics of UB of RAS, Yekaterinburg, 620108 Russia

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Mikhail I. Kurkin

Mikhail I. Kurkin

Theoretical Physics Laboratory, M.N. Mikheev Institute of Metal Physics of UB of RAS, Yekaterinburg, 620108 Russia

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Alexander S. Konev

Alexander S. Konev

Laboratory of Applied Magnetism, M.N. Mikheev Institute of Metal Physics of UB of RAS, Yekaterinburg, 620108 Russia

Laboratory of Radio Electronics and Electronics, Ural Federal University named after the first President of Russia B. N. Yeltsin, Yekaterinburg, 620002 Russia

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Sergey I. Novikov

Sergey I. Novikov

Laboratory of Applied Magnetism, M.N. Mikheev Institute of Metal Physics of UB of RAS, Yekaterinburg, 620108 Russia

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Artem S. Minin

Corresponding Author

Artem S. Minin

Laboratory of Applied Magnetism, M.N. Mikheev Institute of Metal Physics of UB of RAS, Yekaterinburg, 620108 Russia

Department of Biology and Fundamental Medicine, Ural Federal University named after the first President of Russia B. N. Yeltsin, Yekaterinburg, 620002 Russia

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Alexey S. Volegov

Alexey S. Volegov

Department of Magnetism and Magnetic Nanomaterials, Ural Federal University named after the first President of Russia B. N. Yeltsin, Yekaterinburg, 620002 Russia

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Vasily S. Gaviko

Vasily S. Gaviko

Laboratory of Ferromagnetic Alloys, M.N. Mikheev Institute of Metal Physics of UB of RAS, Yekaterinburg, 620108 Russia

Department of Magnetism and Magnetic Nanomaterials, Ural Federal University named after the first President of Russia B. N. Yeltsin, Yekaterinburg, 620002 Russia

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First published: 04 August 2022

Abstract

The phase composition and magnetic properties of FeNi nanoparticles encapsulated in carbon with a nickel content of about 10% are studied in comparison with FeNi nanoparticles of similar composition without carbon coating. The Fe91Ni9 particles have the body centered cubic structure, whereas the Fe88Ni12@C particles have the face centered cubic (FCC) structure. The Fe88Ni12@C particles are characterized with a rather high magnetization of 60 emu g−1 in the field of 30 kOe at 5 K and 40 emu g−1 at 300 K. The monotonous behavior of magnetization with temperature gives grounds to assume that the Fe88Ni12@C particles retain the FCC structure over the entire temperature range down to 5 K. It is concluded that the stabilization of FCC phase of Fe88Ni12@C and the ferromagnetic state of this FCC phase are related to a large concentration of carbon in the core of the nanoparticles.

Conflict of Interest

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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