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  Brandt, R.; Ganss, F.; Senn, T.; Daniel, M.; Albrecht, M.; Schmidt, H.: Frequency tuning the ultrafast magnetization dynamics of Fe_xPt_100-x alloys. Journal of Applied Physics 111 (2012), p. 053918/1-4

10.1063/1.3691954

Abstract:
We report frequency tuning of magnetic oscillations in both planar films and individual patterned nano-sized dots by varying the iron content of disordered FexPt100-x alloys from 42 at. % to 100 at. %. It is seen that as the Fe content is increased, the magnetic oscillation frequency rises by up to 50% in both the films and individual dots due to the change in the saturation magnetization. Micromagnetic simulations and analytic calculations are in agreement with the data. These tunable alloys could be used in microwave-assisted magnetic recording and especially for developing a 3D storage technology where layers of different resonance frequency are switched individually.