Abstract
The magnetization reversal and dynamic behaviors of Ni80Fe20 nanowires (NWs) with controlled periodic width modulation on single and double sides of the wires have been systematically investigated using magneto-optical Kerr effect and broadband ferromagnetic resonance spectroscopy. In contrast with the single resonance mode observed in the homogeneous NWs, the NWs with periodic width modulation display two distinct resonance modes (the fundamental mode at lower frequency and the high frequency mode which is localized in the modulated regions) due to the non-uniform demagnetizing field. An enhancement of the coercive field is observed for the width modulated NWs when compared with homogeneous NWs. We also observed that the high frequency mode and the frequency difference between the two distinct modes are very sensitive to the modulation profile and film thickness. The results obtained from our experimental results agree well with the micromagnetic simulations. The results have potential implications in the design of tunable magnonic filters.
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