Abstract

A spin sensitive tip is needed to realize the spin-polarized STM, which can resolve the spin-polarization of surface density of states. GaAs and its related compound semiconductors are well known as spin-polarized electron sources and are also candidates for the spin probe. We made a GaAs thin film tip by cleavage. Since the GaAs film is thin enough, circular polarized light can illuminate through the tip and efficiently excite spin-polarized electrons near its apex. Because an atomically resolved Si(111) 7×7 surface was observed with the tip, the tip is mechanically stable. Optical responses of the tip were studied with Fe thin films grown on a MgO(001) surface. Using this magnetic thin film, we demonstrated that spin-dependent tunneling could be detected with the tip.

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call

Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.