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We report on a quantitative experimental determination of thethree-dimensional magnetization vector trajectory in GaMnAs by means of thestatic and time-resolved pump-and-probe magneto-optical measurements. Theexperiments are performed in a normal incidence geometry and the time evolutionof the magnetization vector is obtained without any numerical modeling ofmagnetization dynamics. Our experimental method utilizes different polarizationdependences of the polar Kerr effect and magnetic linear dichroism todisentangle the pump-induced out-of-plane and in-plane motions ofmagnetization, respectively. We demonstrate that the method is sensitive enoughto allow for the determination of small angle excitations of the magnetizationin GaMnAs. The method is readily applicable to other magnetic materials withsufficiently strong circular and linear magneto-optical effects.

Direct measurement of the three dimensional magnetization vector trajectory in GaMnAs by a magneto-optical pump-and-probe method