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A hybrid thin-film coplanar line with a slit-patterned CoFeB magnetic film for a rf impedance matching was fabricated, and an effect of the loss reduction by introducing a slit-patterned magnetic film was investigated. The fabricated hybrid thin-film coplanar-line device consisted of the top and bottom 5μm thick copper conductors and an inner (0.5μm thick polyimide)/(0.15μm thick CoFeB)/(0.5μm thick polyimide) trilayer. A signal linewidth was 6μm. The total width of the slit-patterned magnetic film was about 200μm. The devices with some kinds of the width of the magnetic film stripe were fabricated. As a result, insertion loss per unit line length decreased greatly above 1.5GHz with decreasing width of the magnetic film. The loss suppression was due to an effect of reducing the in-plane eddy current of the magnetic film. On the other hand, the propagation signal wavelength of the device increased with decreasing width of the magnetic film, which was due to a decrease of distributed inductance. When applyi...

journal of applied physics

Suppression of insertion loss by slit patterning of a magnetic film in a CoFeB/polyimide hybrid thin-film coplanar line for a rf impedance matching device