Ultrafast Magnetization Dynamics Probed at Elemental M-edges of Ni and Fe Using Tabletop High-Order Harmonic EUV Light

ORAL

Abstract

We show for the first time that EUV light generated from the high-harmonic generation process can be used to observe element-selective femtosecond-to-attosecond magnetization dynamics of magnetic materials. Using the transverse magneto-optic Kerr effect, we measured an asymmetry of reflectivity in a Permalloy film of up to 6{\%} around the M absorption edges of Fe (54eV) and Ni (67eV). Furthermore, we observed an ultrafast demagnetization of the permalloy film within 250 fs after hearting up by a femtosecond pulse.

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Authors

  • Chan La-o-vorakiat

    Deparment of Physics and JILA, University of Colorado at Boulder

  • Stefan Mathias

    Deparment of Physics and JILA, University of Colorado at Boulder

  • Patrik Grychtol

    Institute of Solid State Research, IFF-9, Research Center J\"ulich

  • Roman Adam

    Institute of Solid State Research, IFF-9, Research Center J\"ulich

  • Mark Siemens

    JILA, University of Colorado at Boulder, JILA, National Institute of Standards and Technology, and University of Colorado, Deparment of Physics and JILA, University of Colorado at Boulder

  • Justin Shaw

    Electromagnetics Division, National Institute of Standards and Technology

  • Hans Nembach

    Electromagnetics Division, National Institute of Standards and Technology

  • Claus Schneider

    Institute of Solid State Research, IFF-9, Research Center J\"ulich

  • Martin Aeschlimann

    University of Kaiserslautern and Research Center OPTIMAS

  • Thomas Silva

    Electromagnetics Division, National Institute of Standards and Technology

  • Margaret Murnane

    Deparment of Physics and JILA, University of Colorado at Boulder

  • Henry Kapteyn

    JILA, University of Colorado at Boulder, Deparment of Physics and JILA, University of Colorado at Boulder