SSL Seminar Series 2002 No.4
Title: Photoemission and absorption: Powerful surface-sensitive
tools for magnetic information.
Speaker: Dr Gao Xingyu (Dept. of Physics,
Date: March 26, 2002
Venue: Physics Resource Room (Blk S13 # 02-16)
The basic concepts of photoemission and absorption will be addressed.
They are both powerful tools in the study of surface science with
elemental-specificity and surface sensitivity. By combing the dichroism
technique into photoemission and absorption, further unique magnetic
information will be provided. The flexibility of dichroism in photoemission
will be demonstrated by the angular dependence of dichroism in photoemission
(MDAD) on Co/Cu(001) and Fe/Co/Cu(001), which shows it can even
provide simultaneously magnetic and structural properties on the
surface. The dichroism in absorption, besides being a tool to study
electronic and magnetic information, can also be used as a mechanism
for microscopy technique. The study of magnetic domains using photoemission
electron microscopy shows that not only magnetic microscopic magnetic
information with high spatial resolution but also quantitative information
on magnetic orientation can be obtained. As a intrinsic technique
to study electronic properties, the study of Co Fermi surface by
photoemission from Co/Cu(001) will be presented, which is in good
agreement with the theoretical calculations.