Tunable Sub-Terahertz Resonant Absorption in High-Coercivity Magnetodielectric Ceramics

Авторы: Gorbachev Evgeny A., Alyabyeva Liudmila, Pronin Artem V., Sultanovskaya Alexandra S., Kozlyakova Ekaterina, Magdysyuk Oxana V., Roslyakov Ilya V., Dressel Martin, Gorshunov Boris, Trusov Lev A.
Журнал: Materials Horizons
Год издания: 2024
Издательство: Royal Society of Chemistry
Местоположение издательства: United Kingdom
DOI: 10.1039/d4mh00389f
Аннотация: Recently, giant coercivities (20 – 42 kOe) and sub-terahertz natural ferromagnetic resonance (NFMR) at 100 – 300 GHz were observed for single-domain M-type hexaferrite particles with high aluminum substitution. Herein, we fabricated dense ceramics of Sr0.67Ca0.33Fe8Al4O19 and, for the first time, investigated their magnetostatic and magnetodynamic properties at temperatures 5 – 300 K. It was shown that dense ceramics maintain their high magnetic hardness (the coercivity of 10 – 20 kOe) and NFMR frequencies of 140 – 200 GHz durably in the entire temperature range. Magnetizing the initially non-magnetized ceramics leads to a considerable decrease in the resonance absorption and to an almost complete vanishing of the resonance line at 5 kOe. At the same time, an efficient linear frequency tuning by the external magnetic field was observed for the remanent sample. These findings open new horizons for developing industrial terahertz electronics based on dielectric ferrimagnets.
Добавил в систему: Трусов Лев Артемович

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