Magnetic Circular Dichroism in Two-Photon Photoemission
2009 (English)In: Physical Review Letters, ISSN 0031-9007, Vol. 102, no 5, 057207- p.Article in journal (Refereed) Published
We report the observation of magnetic circular dichroism (MCD) in two-photon photoemission (2PPE). The Heusler alloys Ni2MnGa and Co2FeSi were investigated by excitation with femtosecond laser light, showing MCD asymmetries of A = (3.5 +/- 0.5) x 10(-3) for Ni2MnGa and of A = (2.1 +/- 1.0) x 10(-3) for Co2FeSi, 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.
Place, publisher, year, edition, pages
2009. Vol. 102, no 5, 057207- p.
IdentifiersURN: urn:nbn:se:uu:diva-137317DOI: 10.1103/PhysRevLett.102.057207ISI: 000263166400060OAI: oai:DiVA.org:uu-137317DiVA: diva2:378190