Issue 16, 2024

Tunable sub-terahertz resonance absorption in high-coercivity magnetodielectric ceramics

Abstract

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 in the temperature range of 5–300 K. It was shown that dense ceramics maintain their high magnetic hardness (a 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 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.

Graphical abstract: Tunable sub-terahertz resonance absorption in high-coercivity magnetodielectric ceramics

Supplementary files

Article information

Article type
Communication
Submitted
04 Apr 2024
Accepted
04 Jun 2024
First published
04 Jun 2024

Mater. Horiz., 2024,11, 3844-3855

Tunable sub-terahertz resonance absorption in high-coercivity magnetodielectric ceramics

E. A. Gorbachev, L. N. Alyabyeva, A. V. Pronin, A. S. Sultanovskaya, E. S. Kozlyakova, O. V. Magdysyuk, I. V. Roslyakov, M. Dressel, B. P. Gorshunov and L. A. Trusov, Mater. Horiz., 2024, 11, 3844 DOI: 10.1039/D4MH00389F

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