The Effects of Thermomagnetic Treatment on the Magnetic Properties of Nanocrystalline Fe–O and Fe-Co–O Pressed Compacts

Lileev A.S. Kargin J. Konyukhov Y.V. Zhukov D.G. Cornejo H.S. Seo J.W. Holmes S.N. Aguiar J.A. Barnes C.H.W. De Los Santos Valladares L.
February 2025 Springer

Journal of Superconductivity and Novel Magnetism
2025 #38 Issue 1

The influence of thermal and thermomagnetic treatment on the magnetic properties of iron—cobalt oxides compacts fabricated by powder metallurgy is studied. The influence of magnetic pulse processing (MPP) on the formation of the phase composition and magnetic properties of nanocrystalline α-Fe (50%) + Fe₂O₃ (50%); α-Fe (50%) + Fe₂O₃ (40%) + Co₃O₄ (10%) and α-Fe (50%) + Fe₂O₃ (30%) + Co₃O₄ (20%) pressed powder compacts during synthesis in a high-energy mill and subsequent annealing have been investigated. According to the X-ray diffraction analysis, annealing α-Fe (50%) + Fe₂O₃ (50%) pressed samples at 250 ℃ in air, promotes the oxidation of α-Fe and FeO to magnetite (Fe₃O₄). Additional annealing of the compact in vacuum at 250 ℃ increases its remnant magnetization and magnetic anisotropy. Whereas, increasing the concentration of Co₃O₄ oxide has no strong effect on the coercivity and residual magnetization of the compacts. Eventually, thermomagnetic treatment of the α-Fe (50%) + Fe₂O₃ (30%) + Co₃O₄ (20%) system does not improve its magnetic properties.

Fe-Co Powder Compacts , Magnetic properties , Magnetic pulse processing , Nanocrystalline powders , Powder metallurgy , Thermomagnetic processing

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National University of Science and Technology “MISIS”, 4/1 Leninskii Ave., Moscow, 119049, Russian Federation
L.N. Gumilyov Euroasian National University, Satpayev Str. 2, Astana, 010008, Kazakhstan
Laboratorio de Ceramicos y Nanomateriales, Facultad de Ciencias Físicas, Universidad Nacional Mayor de San Marcos, Ap. Postal 14-0149, Lima, Peru
College of Science and Technology Convergence, Yonsei University, Wonju, 26493, South Korea
Department of Electronic and Electrical Engineering, University College London, Torrington Place, London, WC1E 7JE, United Kingdom
Programa de Pós-Graduação Em Ciências de Materiais, Centro de Ciências Exatas E da Natureza, Universidade Federal de Pernambuco, PE, Recife, 50670-901, Brazil
Cavendish Laboratory, Department of Physics, University of Cambridge, J.J. Thomson Ave, Cambridge, CB3 0HE, United Kingdom

National University of Science and Technology “MISIS”
L.N. Gumilyov Euroasian National University
Laboratorio de Ceramicos y Nanomateriales
College of Science and Technology Convergence
Department of Electronic and Electrical Engineering
Programa de Pós-Graduação Em Ciências de Materiais
Cavendish Laboratory

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