Abstract
Magnetic films having in the gigahertz range high real permeability μ′ and yet exhibiting weak imaginary permeability μ″ (thus low in tanδ=μ″∕μ′) are in great need recently, for use in next-generation magnetic devices such as radio frequency identification (RFID) tags utilizing 900MHz or 2.45GHz band. In this study we successfully prepared films (composition: Ni0.23±0.01ZnxCoyFe2.76±0.01−x−y, x=0–0.34 and y=0.23–0.27) which exhibit such highly capable complex permeability spectra. They were prepared from an aqueous solution at 90°C by spin spray ferrite plating. The films are very low in magnetic losses, having tanδ=0.05–0.14 even at 900MHz, because they have high natural resonance frequencies, fr=3.3–5.4GHz. The tanδ is much lower than that (>0.4) observed for composite-type magnetic sheets at 900MHz. Transmission characteristics of 900MHz band RFID tags were prominently improved by placing the ferrite films of 3μm thickness on the tags.
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