Barium-ferrite (BaFe12O19) single crystals with a high anisotropy field and low millimetre-wave (mm-wave) losses have been grown from high-temperature solutions. The high internal field (17/4π MA/m) considerably reduces the external magnetic field required for spin resonance at mm-wave frequencies. Due to the progress in single-crystal barium-ferrite technology, it is possible to extend the tuning range of filters up to 90 GHz. A compact tunable filter, similar to y.i.g.-filters, has been built and the first results are reported.
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Lemke et al. (1979) studied this question.
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