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Spinpolarized STM (SPSTM) is a powerful tool to visualize sample spinpolarization vectors at an atomic scale. A di‹culty of SPSTM measurement is how to fabricate a tip with a stable spinpolarization vector. In 1990's, ˆrst, many eŠorts were payed for a GaAs tip with optically pumping, but ˆnally the GaAs tip did not detect sample spin polarization due to quenching of the spinpolarization at the GaAs tip apex. However, in 2000, a W tip coated by a magnetic thin ˆlm detected the spinpolarized tunneling current, and spin polarization images of magnetic atoms were successfully obtained. In 2016, more than 15 groups in the world can perform SP STM measurements. History and issues for further development of SPSTM measurements are discussed.

Spin-Polarized STM Overview and Issues for Next Developments