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Frequency-field dependence of real part of characteristic impedance of iron borat

Tunable reflective structures based on weak ferromagnetics and their application as tunable sub-terahertz resonators

Igor V. Zavislyak, Hryhorii L. Chumak


Electromagnetic eigenwaves in a weak ferromagnetic with anisotropy of the “easy plane” under magnetization in this plane are investigated. It is shown that at frequencies of anti-resonances the weak ferromagnetic can be considered as environment with characteristic impedance close to zero. The polarization of eigenwaves in such environment is analyzed on the example of high-temperature weak ferromagnetics—hematite and iron borate. It is proposed to consider the weak ferromagnet–metal structure as an element of the metasurface with a controlled phase shift of the reflected wave. A tunable Fabry–Perot resonator with a weak ferromagnet–metal structure (ferromagnet is of sub-wave thickness) is considered and the corresponding frequency-field dependencies in the sub-terahertz range are studied. It is shown that such resonator combines rather high Q-factor with a possibility of magnetic tuning of its resonance frequency. The maximum local slope of the field dependence of the resonator frequency reaches 0.3 MHz/Oe using a hematite layer and 0.6 MHz/Oe using an iron borate layer of 10 mm thickness. The resonator unloaded quality factor for the main mode varies within 300–1400 and 250–1000, respectively.


weak ferromagnetic; iron borate; hematite; Fabry–Perot resonator; metasurface; sub-terahertz range

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