Early Stages of Ultrafast Spin Dynamics in a 3d Ferromagnet

R. Gort, K. Bühlmann, S. Däster, G. Salvatella, N. Hartmann, Y. Zemp, S. Holenstein, C. Stieger, A. Fognini, T. U. Michlmayr, T. Bähler, A. Vaterlaus, Y. Acremann

    Research output: Contribution to journalArticleScientificpeer-review

    22 Citations (Scopus)
    32 Downloads (Pure)

    Abstract

    Prior to the development of pulsed lasers, one assigned a single local temperature to the lattice, the electron gas, and the spins. With the availability of ultrafast laser sources, one can now drive the temperature of these reservoirs out of equilibrium. Thus, the solid shows new internal degrees of freedom characterized by individual temperatures of the electron gas Te, the lattice Tl and the spins Ts. We demonstrate an analogous behavior in the spin polarization of a ferromagnet in an ultrafast demagnetization experiment: At the Fermi energy, the polarization is reduced faster than at deeper in the valence band. Therefore, on the femtosecond time scale, the magnetization as a macroscopic quantity does not provide the full picture of the spin dynamics: The spin polarization separates into different parts similar to how the single temperature paradigm changed with the development of ultrafast lasers.

    Original languageEnglish
    Article number087206
    Number of pages5
    JournalPhysical Review Letters
    Volume121
    Issue number8
    DOIs
    Publication statusPublished - 2018

    Fingerprint

    Dive into the research topics of 'Early Stages of Ultrafast Spin Dynamics in a 3d Ferromagnet'. Together they form a unique fingerprint.

    Cite this