The Development of Spin-Polarized STM with Atomic Resolution

本研究的目的是研制一种SP-STM。(1)1992年，我们成功地观察到自旋极化隧穿电流，它取决于入射到GaAs样品的光的圆度和Ni尖的极化。这意味着研制SP-STM的可能性。(2)我们研制了GaAs和过渡金属的超高真空SP-STM。(3)利用超高真空STM测量了Ni和Fe的STS和电流自旋极化随针尖偏压的变化，并从中反映出能带结构。(4)我们对超高真空STM自旋调谐现象进行了基础研究，结果证实我们可以利用GaAs针尖发展SP-STM。

The research purpose is developing an SP-STM.(1) In 1992 we succeeded in observing the spin polarized tunneling current which depends on the circularity of the incident light to GaAs samples and plarization of Ni tips. This means the possiblitiy of developing SP-STM.(2) We have developed UHV SP-STM with GaAs and transition metals.(3) Using the UHV STM we measured STS and the current spin polarization against tip bias for Ni and Fe in which energy band structure reflected.(4) We have studied the basic research on spin tuneling phenomena by UHV STM and as a result it has been confirmed that we can develop the SP-STM using a GaAs tip.