Abstract
We report the observation of magnetic circular dichroism (MCD) in two-photon photoemission (2PPE). The Heusler alloys and were investigated by excitation with femtosecond laser light, showing MCD asymmetries of for and of for , respectively. A theoretical explanation is provided based on local spin-density calculations for the magnetic dichroic response; the computed 2PPE MCD agrees well with the experiment. The observed 2PPE magnetic contrast represents an interesting alternative for future time-resolved photoemission studies on surface magnetism practicable in the laboratory.
- Received 22 April 2008
DOI:https://doi.org/10.1103/PhysRevLett.102.057207
©2009 American Physical Society