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Ultrathin Co layers grown on Au(111) surface were observed by means of a scanning tunneling microscope (STM) equipped with a p-type GaAs tip. The GaAs tips were made either by in-air cleavage or micro-fabrication process and were illuminated through the sample by a He-Ne laser or a GaAlAs laser to excite spin-polarized electrons inside. The spin polarization was modulated by modulating laser beam...
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