Abstract
Vacuum tunneling of spin-polarized electrons from a ferromagnetic tip into a Cr(001) single crystal has been observed by means of a scanning tunneling microscope (STM) operated in UHV. Topographic STM images of the Cr(001) surface using a tungsten tip confirm the model of topological antiferromagnetism between ferromagnetic terraces separated by monatomic steps of 0.144 nm height. With tips, the measured step-height values alternate around the mean value of 0.144 nm due to an additional contribution from spin-polarized-electron tunneling.
- Received 27 March 1990
DOI:https://doi.org/10.1103/PhysRevLett.65.247
©1990 American Physical Society