Title

Novel planer microwave circuit applications and characterization of ni nanowires

Abstract

Arrays of Ni nanorods were electrodeposited into alumina oxide templates with various lengths (11-50 Jim) and fixed pore diameter (150 nm). The magnetization behavior of these rods were investigated with ferromagnetic resonance (FMR) techniques; fixed frequency (conventional FMR) and swept frequency (Network Analyzer FMR). Both resonance spectra indicate the presence of strong dipolar interaction between the nanorods. The fundamental magnetic parameters like spontaneous magnetization, gyromagnetic ratio (γ), and magnetic anisotropies of the nanorods were derived from the angular variation of resonance field H r(0 H) data. Further, the use of nanorods as a tunable stop-band notch-filter in a coplanar waveguide geometry has been assessed. The stop-band frequency (f r) is observed to be tunable up to 24 GHz with an applied field (H) of up to 6 kOe. The theoretical fitting of f r.(H) data to resonance relation yield values of effective field (H eff) and γ, which are a little higher than the conventional FMR results. © 2008 Materials Research Society.

Publication Title

Materials Research Society Symposium Proceedings

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