Geometry of the all-optical TR-MOKE and SHG pump-probe experiment for a fourfold anisotropic system: Here, the hard and easy axes correspond to the  and -type crystallographic directions in the Fe film plane, respectively. is a laboratory coordinate system; the external field; : azimuth of the hard axis ; : angle between magnetization and hard axis ; : azimuthal angle of ; : angle of incidence.
Time profiles of (a) the MSHG and (b) the Kerr rotation in polarization combination for a Fe (26 nm)/Cr (2 nm) bilayer at and : A constant offset of about 2500 counts is subtracted in (a) for clarity. (c) TR-MOKE and TR-MSHG signals on an expanded time scale reveal a phase shift.
Fourier transforms of the (a) TR-MOKE and (b) TR-MSHG signals for Fe (26 nm)/Cr (2 nm) and Fe (32 nm)/Cr (2 nm) films measured under the same conditions as in Fig. 2.
Magnetic field dependence of the MSHG intensity in (a) Fe (26 nm) and (b) Fe (34 nm) films: The red line shows calculations using Eq. (1) at the following set of parameters (counts), (counts), (counts) for Fe (26 nm) film and (counts), (counts), (counts) for Fe (34 nm) film.
(a) Experimental (black) and calculated (red) temporal MSHG intensity variations in Fe (26 nm) film after applying an ultrashort laser pulse: The calculations are performed using Eq. (1) and the parameters obtained by fitting the static MSHG field dependencies shown in Fig. 4. (b) Fourier spectrum of the calculated time profile in (a).
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