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The interface and bulk magnetization dynamics of single-crystalline, wedge-shaped Fe (001) thin films with Cr cap layers have been studied by time-resolved magneto-optical Kerr effect (MOKE) and time-resolved magnetization-induced second harmonic generation (MSHG) using an all-optical pump-probe technique. We observed long-lived (approximate to 1 ns) MOKE and MSHG oscillations excited by ultrashort (approximate to 150 fs) optical pulses. They exhibit the same main resonance frequency f and damping constant. However, a 90 S phase shift was observed between linear and nonlinear responses proving that MOKE and MSHG oscillations are related to the temporal variations of different magnetization components M-z and M-y. Additionally, we found weak oscillations at the double frequency 2f. Comparing the results of static and dynamic MSHG measurements we evaluate the in-plane amplitude of the optically excited interfacial magnetization oscillations. (C) 2008 American Institute of Physics. [DOI: 10.1063/1.3005884

Interface and bulk magnetization dynamics in biaxial Fe/Cr structures induced by ultrashort optical pulses