Ultrafast spin dynamics in Co2FeAl alloy film under perpendicular external magnetic field
This study investigated the laser-induced ultrafast spin dynamics of Co2FeAl Heusler alloy film under a perpendicular external magnetic field by using the time-resolved magneto-optical Kerr spectroscopy technique.The experimental results indicate that two spin-wave modes,the surface wave mode and the standing wave mode,are excited simultaneously in the strictly perpendicular external magnetic field,and both modes exhibit the special phenomenon of decreasing spin-wave frequencies with increasing magnetic field strength.Furthermore,the analysis of the decay characteristics reveals that the magnetic damping factor of standing wave mode remains constant regardless of the external magnetic field.Conversely,the magnetic damping of surface wave mode increases as the external magnetic field strength increases.The group velocity of the surface wave mode was analyzed to deter-mine the causes of the external field-dependent properties of the magnetic damping of this mode.Our experiment reveals the spin-wave dynamic characteristics of Co-based Heusler alloy film under the strictly perpendicular external magnetic field,which has positive significance for advancing the appli-cation of such materials in next-generation spintronic devices.
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