We investigate ultra-small band-stop filters made with continuous Fe films and with multilayered Fe∕Cu films. In ferromagnetic resonance measurements, the continuous Fe(100nm) film had a larger linewidth, on the order of 200Oe at 10GHz, resulting in a device linewidth, which typically was close to 2GHz in the operational device. In contrast a [Fe(5nm)∕Cu(0.8nm)]20 multilayer structure showed a ferromagnetic resonance linewidth of 50Oe at 10GHz and had a device linewdith of about 0.5GHz. We expect that the breaking of the Fe films by Cu reduces the typical size of crystallites in Fe, thus reducing the linewidth. The filter demonstrates wide tuning range of 10–30GHz with bias fields up to 4kOe. This work demonstrates a single notch-filter, which can operate from X- to K-band with a linewidth of 1.8GHz at 0.07kOe and 0.33GHz at 4.0kOe. The measured minimum insertion loss in each case is ∼2.5dB, with greater than 15dB return loss in the entire pass-band frequency.
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Kuanr et al. (2005) studied this question.
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