Abstract
A study of ferromagnetic resonance in square hollow nanopillars was carried out, with the aim of analyzing the effects of geometry. Nanopillars (NPs) with L = 120 nm length and D = 30 nm external width were studied. By fitting the data for parallel field and using the Primary peak, the anisotropy field was HA = 97.2, 116.4 and 144.5 kA/m for d = 0, 10 and 20 nm, respectively. For perpendicular field, HA = 175, 193 and 251 kA/m for d = 0, 10 and 20 nm, respectively. The variations were attributed to the increase in dipole interactions, as the cavity size increases. A secondary peak was also fitted and HA = 222.5, 220 and 226.9 kA/m were obtained for parallel configuration. Thus, this secondary peak, from regions whose local field varies little with the dimensions of the cavity, were attributed to the effects of parallel edges.
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