Temperature effect on magnetic characteristics of Fe-Cr-Co-Si alloy specimens processed by thermomagnetic treatments

Haider, Ali and Khan, Muhammad Ali and Jaffery, Syed Husain Imran and Faraz, Muhammad Iftikhar and Khan, Aamir Nusair and Petru, Jana and Abduvalieva, Dilsora and Al-Harbi, F. F. (2025) Temperature effect on magnetic characteristics of Fe-Cr-Co-Si alloy specimens processed by thermomagnetic treatments. Materials Technology, 40 (1). ISSN 1066-7857

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Abstract

Fe-Cr-Co magnets getting research focus due to the rapid increase of magnet demand, especially for super-speed motors owing to their remanence values equivalent to that of NdFeB super magnets. In this work, the magnetic characteristics in Fe-Cr-Co-Si alloy samples were induced by processing through isothermal thermomagnetic and step aging treatments, and then, the samples were investigated for thermal effect on magnetic characteristics. The effects of an increase in temperature on the remanence, coercivity and energy product were measured using a BH-Curve tracer. The specimens were prepared from the thermomagnetically processed and aged alloy bricks. Demagnetisation curves were measured at temperatures ranging from 20 °C to 400 °C, and the results were also analysed for thermal variation coefficients. A decline in magnetic properties with increasing temperature was noted. At 400 °C, the magnetic induction is reduced by 0.03%, the coercivity by 0.018% and the energy product decreased by 0.12% per kelvin.

Item Type:	Article
Identification Number:	10.1080/10667857.2025.2595685
Dates:	Date Event 21 November 2025 Accepted 30 November 2025 Published Online
Uncontrolled Keywords:	Fe-Cr-Co magnets, thermomagnetic treatment, step-aging, spinodal decomposition, coercivity, magnet temperature coefficient
Subjects:	CAH10 - engineering and technology > CAH10-01 - engineering > CAH10-01-01 - engineering (non-specific)
Divisions:	Architecture, Built Environment, Computing and Engineering > Engineering
Depositing User:	Gemma Tonks
Date Deposited:	16 Feb 2026 12:52
Last Modified:	16 Feb 2026 12:52
URI:	https://www.open-access.bcu.ac.uk/id/eprint/16869

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