Abstract
By means of time-resolved magneto-optical measurements under very low-power ultrafast laser excitation (~ 2 μJ/cm2) a strong magnetic linear dichroism (MLD) effect is observed in a 10 nm-thick Fe film grown on an n-doped GaAs (001) by using molecular beam epitaxy (MBE). The dynamic magneto-optical responses are found to depend strongly on the orientation of the polarization of the probe beam, indicating that a strong MLD response is present in the Fe/GaAs hybrid structure. Our observations provide an efficient way to enhance the detective sensitivity when dealing with the weak magneto-optical response under very low-power optical pumping by choosing an appropriate orientation of the probe’s polarization. This method can also be applied to other ferromagnetic thin films to measure the full three-dimensional magnetization vector without changing the sample’s orientation or the optical detection geometry.
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