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Physical Review B
The magnetization dynamics of single-crystalline Fe͑001͒ thin films with Cr cap layers has been studied by an all-optical time-resolved pump-probe technique. The system is characterized by a fourfold in-plane magnetic anisotropy. We observed long-lived ͑ϳ1 ns͒ magnetization oscillations caused by the ultrafast ͑ϳ0.15 ps͒ optical pulse excitation. The oscillations are associated with the temporal variation of the magnetization component M z normal to the film surface. The phase of thedoi:10.1103/physrevb.75.224434 fatcat:4jxbuiid7vfxdkzgpy4tew5jhq