Patterned magnetic films on submicron scale have evoked rising attention. Arrays of submicron size magnetic elements are proposed to be used for high-density storage media, magnetic random access memory, spin-logic devices etc. Ferromagnetic resonance (FMR) is a powerful technique for studying both static and dynamic properties of magnetic thin films. It can provide information on the magnetization, magnetic anisotropy, exchange constant and the damping constant of spin dynamics in ultrathin films. In this paper we report the FMR studies of patterned trilayer films with same aspect ratio and changing element size showing clear evidence of in-plane spin-wave excitation under perpendicular magnetic field.
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