(Color online) (a) Sample geometry. Pump beam was incident normal to the film plane while the probe was incident at 45° with respect to the normal of the sample plane. The angle θ is the pump polarization angle compared to the axis of the sample. (b) Signal collection system. The reflected probe beam was turned into p-polarized and s-polarized beams by the polarized cube. A balance detector was used to determined the DMK Signal. (c) Pump-probe DMK curves under various pump polarization angles.
(Color online) (a) Excitation amplitude as a function of pump polarization. (b) Evolution of DMK spectra around the axis.
(Color online) Oscillation frequency as a function of applied field. The line is the fit to the data.
(Color online) (a) Excitation amplitude as a function of pump polarization from −0.4° to 0.5° compared to the axis. The inset shows the schematic diagram of magnetization reorientation. (b) Pump-probe DMK spectra under various pump powers.
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