Hard Ferrite Magnetic Insulators Revealing Giant Coercivity and Sub-Terahertz Natural Ferromagnetic Resonance at 5 – 300 K

Авторы: Gorbachev Evgeny A., Kozlyakova Ekaterina, Alyabyeva Liudmila, Ahmed Asmaa, Trusov Lev A.
Журнал: Materials Horizons
Том: 10
Год издания: 2023
Издательство: Royal Society of Chemistry
Местоположение издательства: United Kingdom
Первая страница: 1842
Последняя страница: 1847
DOI: 10.1039/d3mh00089c
Аннотация: The temperature behavior of the magnetic properties is crucial for the application of magnetic materials. Recently, giant room temperature coercivities (20–36 kOe) and sub-terahertz natural ferromagnetic resonance (NFMR) frequencies (160–250 GHz) were observed for single-domain M-type hexaferrites with high aluminum substitution. Herein, the temperature dependences of the magnetic properties and natural ferromagnetic resonance are studied at 5–300 K for single-domain Sr1−x/12Cax/12Fe12−xAlxO19 (x = 1.5–5.5) particles. It is shown that the samples maintain their magnetic hardness over the whole temperature range. The coercivity and NFMR frequencies have a maximum shifting to the low-temperature region with a rise in aluminum concentration. The highest coercivity of 42 kOe and the maximum NFMR frequency of 297 GHz are observed for x = 5.5 at 180 K.
Добавил в систему: Трусов Лев Артемович

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