Origin of Large Coercivity in Charge-Ordered Lanthanide-Free Magnets | Sciact - CRIS-система Института катализа

Origin of Large Coercivity in Charge-Ordered Lanthanide-Free Magnets Научная публикация

Журнал

Materialia
ISSN: 2589-1529

Вых. Данные

Год: 2025, Том: 39, Номер статьи : 102316, Страниц : 13 DOI: 10.1016/j.mtla.2024.102316

Ключевые слова

XMCD; XANES; Coercive field; Charge ordering; Element-specificity; Magnetism

Авторы

Platunov Mikhail S. ¹ , Platunov Aleksandr M. ²

Организации

1	Boreskov Institute of Catalysis SB RAS, Novosibirsk 630090, Russia
2	Municipal autonomous general education institution of the city of Novosibirsk "Educational center - gymnasium No. 6 "Ermine", Novosibirsk 630117, Russia

Информация о финансировании (1)

Министерство науки и высшего образования Российской Федерации (с 15 мая 2018)

075-15-2022-263

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.

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 OpenAlex

Поступила в редакцию:	5 авг. 2024 г.
Принята к публикации:	9 дек. 2024 г.
Опубликована online:	9 дек. 2024 г.
Опубликована в печати:	1 мар. 2025 г.

Web of science:	WOS:001388257200001
Scopus:	2-s2.0-85211500246
OpenAlex:	W4405175585

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