Magnetic Circular Dichroism in Two-Photon Photoemission

6533b826fe1ef96bd128537a

RESEARCH PRODUCT

Magnetic Circular Dichroism in Two-Photon Photoemission

K. Hild J. Maul Peter M. Oppeneer Martin Amft Hans-joachim Elmers Gerd Schönhense

subject

Circular dichroism Materials science Magnetic circular dichroism General Physics and Astronomy Angle-resolved photoemission spectroscopy Laser Molecular physics law.invention Nuclear magnetic resonance X-ray magnetic circular dichroism law Femtosecond Vibrational circular dichroism Excitation

description

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)x10;{-3} for Ni2MnGa and of A=(2.1+/-1.0)x10;{-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.

year	journal	country	edition	language
2009-02-06	Physical Review Letters

https://doi.org/10.1103/physrevlett.102.057207

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