Exploitation of femto-second time resolved ultraviolet magnetic circular dichroism photoelectron emission microscopy

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We invented a novel magnetic microscope, based on ultraviolet (UV) magnetic circular dichroism (MCD) photoelectron emission microscope (PEEM) with a spatial resolution of ～50nm using tunable UV lasers, and further developed a femto-second time-resolved pump-and-probe mciroscope. This performance is much superior to a similar method of X-ray MCD PEEM using a third-generation synchrotron radiation light source since this method allows in-laboratory experiments and thousand times faster time resolving power. Moreover, we succeeded in the observation of two-photon UV MCD PEEM images with a high sensitivity. We also investigated the origin of the huge enhancement of the MCD sensitivity in the vicinity of the work function threshold by using the angle-resolved photoemission spectroscopy.