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Copyright Â© 2001 American Institute of PhysicsThe rise and damping of spin excitations in three Ni81Fe19 films of thickness 50, 500, and 5000 Ã\u85 have been studied with an optical pumpâ\u80\u93probe technique in which the sample is pumped with an optically triggered magnetic field pulse. The motion of the magnetization was described by the uniform mode solution of the Landauâ\u80\u93Lifshitzâ\u80\u93Gilbert equation. The rise time of the pulsed field within the film was smallest in the 50 Ã\u85 sample and was generally greater when the pulsed field was perpendicular to the film plane. The damping constant was smallest in the 500 Ã\u85 sample. The variations in the rise time and damping are attributed to the presence of eddy currents and structural disorder in the films. Under certain excitation conditions a second mode was observed in the 5000 Ã\u85 sample which we believe to be a magnetostatic surface mode

Investigation of the rise time and damping of spin excitations in Ni81Fe19 thin films