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(a) Schematic diagram of the experimental configuration for Kerr rotation setup. The magnetic field is in the sample plane. The probe light is with a back-reflected geometry and the pump beam is with oblique incidence at an angle of away from the probe beam. (b) Shows that spin will experience either clockwise (for ) or counter-clockwise (for ) rotation in the plane perpendicular to the magnetic field due to the magnetic torque. (c) Indicates that the change in the magnetic field direction will also reverse the direction of the spin precession, which is helpful to determine the sign of the factor.
The time-resolved Kerr rotation data for (a) GaAs thin film, (b) GaAs 2DEG, and (c) GaAsN/GaAs QW with nitrogen composition of 1.5%. (a) and (b) at and (c) at .
The Kerr rotation data on the GaAsN/GaAs QW sample measured at (a) , (b) , and (c) . The temperature is at .
The magnetic field dependence of the Kerr rotation signal at fixed delay time of 170 ps for (a) GaAs thin film, (b) GaAs 2DEGs, and (c) GaAsN/GaAs QW.
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