Origin of Large Coercivity in Charge-Ordered Lanthanide-Free Magnets Full article
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Materialia
ISSN: 2589-1529 |
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| Output data | Year: 2025, Volume: 39, Article number : 102316, Pages count : 13 DOI: 10.1016/j.mtla.2024.102316 | ||||
| Tags | XMCD; XANES; Coercive field; Charge ordering; Element-specificity; Magnetism | ||||
| Authors |
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| Affiliations |
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Funding (1)
| 1 | Ministry of Science and Higher Education of the Russian Federation | 075-15-2022-263 |
Abstract:
Lanthanide-based permanent magnets are essential for a wide range of applications, from nanotechnology to industrial engineering. However, the limited availability and escalating costs of rare-earth elements have spurred efforts to develop alternative lanthanide-free magnets. Low-dimensional magnetic oxides, such as Co3BO5 and Co2FeBO5 single crystals (space group Pbam), offer a promising solution due to their structural properties and potential for stabilizing charge-ordered states. This study investigates the influence of nanodomains on macroscopic coercivity in these materials, revealing that domain wall pinning and high-energy barriers significantly impede domain wall motion, resulting in exceptional coercive fields. Notably, Co2FeBO5 exhibits a giant coercive field exceeding 9 Tesla at low temperatures. X-ray absorption and single crystal X-ray diffraction confirmed the mixed-valent character of Co and Fe ions, showing a 3+ oxidation state at the M4 sites and 2+ at other sites (M1, M2, M3). X-ray magnetic circular dichroism (XMCD) further revealed element-selective magnetizations in opposing directions below the Néel temperature, indicative of strong antiferromagnetic interactions persisting even in the paramagnetic state. These unprecedented coercivities are attributed to the interaction of alternating magnetic sublattices formed by adjacent ions, influenced by the crystallographic symmetry. By precisely substituting ions at specific crystallographic sites (M1–M4), it is possible to modulate local magnetic anisotropy and establish regions with high energy barriers, effectively enhancing the material's resistance to demagnetization. This targeted optimization of magnetic properties positions these materials as strong candidates for applications demanding stable and robust magnetic performance under challenging conditions.
Cite:
Platunov M.S.
, Platunov A.M.
Origin of Large Coercivity in Charge-Ordered Lanthanide-Free Magnets
Materialia. 2025. V.39. 102316 :1-13. DOI: 10.1016/j.mtla.2024.102316 WOS Scopus РИНЦ OpenAlex
Origin of Large Coercivity in Charge-Ordered Lanthanide-Free Magnets
Materialia. 2025. V.39. 102316 :1-13. DOI: 10.1016/j.mtla.2024.102316 WOS Scopus РИНЦ OpenAlex
Dates:
| Submitted: | Aug 5, 2024 |
| Accepted: | Dec 9, 2024 |
| Published online: | Dec 9, 2024 |
| Published print: | Mar 1, 2025 |
Identifiers:
| Web of science: | WOS:001388257200001 |
| Scopus: | 2-s2.0-85211500246 |
| Elibrary: | 80739332 |
| OpenAlex: | W4405175585 |
Citing:
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