Magnetic Circular Dichroism in Two-Photon Photoemission

K. Hild, J. Maul, G. Schönhense, H. J. Elmers, M. Amft, and P. M. Oppeneer
Phys. Rev. Lett. 102, 057207 – Published 6 February 2009

Abstract

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)×103 for Ni2MnGa and of A=(2.1±1.0)×103 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.

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  • Received 22 April 2008

DOI:https://doi.org/10.1103/PhysRevLett.102.057207

©2009 American Physical Society

Authors & Affiliations

K. Hild, J. Maul*, G. Schönhense, and H. J. Elmers

  • Institut für Physik, Staudinger Weg 7, Universität Mainz, D-55128 Mainz, Germany

M. Amft and P. M. Oppeneer

  • Department of Physics and Materials Science, Uppsala University, Box 530, S-75121 Uppsala, Sweden

  • *jmaul@uni-mainz.de

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Vol. 102, Iss. 5 — 6 February 2009

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