Fig. 1
Nano-constriction fabrication, characterization, and simulation. a Scanning electron microscope image of a permalloy nano-constriction showing its width (w = 30 nm) and the direction of the applied field. b Gilbert damping of blanket permalloy films as a function of film thickness. Inset: AMR (closed symbol) and resistance (open symbol) vs. thickness of 30 nm wide nano-constrictions. c ST-FMR spectrum vs. field at f = 10 GHz for a w = 30 nm and t = 15 nm nano-constriction showing its two linear modes; red and blue lines are Lorentzian fits to the FMR mode and the localized mode, respectively. The spatial distribution of the FMR and the localized modes, imaged by μ-BLS (d, e), and calculated using micromagnetic simulations (f, g)
