Restraining electromagnetic interference in the millimeter-wave region has been accomplished with a new electromagnetic absorber composed of ε-GaxFe2−xO3 (0.10≤x≤0.67) nanomagnets, which shows a ferromagnetic resonance in the range 35–147 GHz. The possibility that the ferromagnetic resonance can achieve a frequency of 190 GHz at x→0 is also suggested. See picture: Hc=coercive field; fr=ferromagnetic resonance frequency.
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Ohkoshi et al. (2007) studied this question.
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