Kargin, J;
Lileev, AS;
Konyukhov, YV;
Zhukov, DG;
Sanchez Cornejo, H;
Seo, JW;
Holmes, SN;
... De Los Santos Valladares, L; + view all
(2025)
A phenomenological approach for understanding the high magnetic coercivity state of a Fe-O nanocrystalline press-compact.
IEEE Transactions on Magnetics
, 61
(9)
, Article 1000310. 10.1109/TMAG.2025.3587795.
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Abstract
Experimentally obtained magnetic signals for a Fe-O nanocrystalline press-compact were fitted using a phenomenological approach. This method considers the individual properties of microvolumes and their statistics. It also helps avoiding complex calculations while focusing on local fundamental magnetic characteristics without considering internal processes. Currently, the precise estimation of internal processes in local areas is nearly impossible. They depend on fluctuations in the anisotropy field, texture degree, and phase ratio. A cubic compact (10<sup>3</sup> mm<sup>3</sup> volume) was fabricated by pressing magnetite particles mixed with 20% iron by weight in a high-energy milling machine. After characterizing the compacts by X-ray diffraction, their magnetic signals were measured to obtain the saturation magnetization (M<inf>s</inf> = 0.97 T) residual magnetization (M<inf>r</inf> = 0.456 T) and coercivity (Н<inf>с</inf> = 0.685 kOe). The results suggest that the particle anisotropy fields relate to the effective anisotropy constants from the interaction between iron and magnetite particles. It is also found that single domains formed by iron particles contribute to high coercive states. This confirms that increasing the degree of texture results in an increment of the relative remanence and coercivity.
| Type: | Article |
|---|---|
| Title: | A phenomenological approach for understanding the high magnetic coercivity state of a Fe-O nanocrystalline press-compact |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1109/TMAG.2025.3587795 |
| Publisher version: | https://doi.org/10.1109/tmag.2025.3587795 |
| Language: | English |
| Additional information: | © 2025 The Authors. This work is licensed under a Creative Commons Attribution 4.0 License (https://creativecommons.org/licenses/by/4.0/). |
| Keywords: | Iron oxide, magnetic properties of materials, nanocrystalline powder, press compacts |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10212807 |
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