The influence of the excitation pulse length on ultrafast magnetization dynamics in nickel | Zendy

Andreas Fognini | Zendy; G. Salvatella | Zendy; Rafael Gort | Zendy; T. Michlmayr | Zendy; A. Vaterlaus | Zendy; Yves Acremann | Zendy

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The influence of the excitation pulse length on ultrafast magnetization dynamics in nickel

Author(s) -

Andreas Fognini,

G. Salvatella,

Rafael Gort,

T. Michlmayr,

A. Vaterlaus,

Yves Acremann

Publication year - 2015

Publication title -

structural dynamics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.415

H-Index - 29

ISSN - 2329-7778

DOI - 10.1063/1.4914891

Subject(s) - femtosecond , ultrashort pulse , picosecond , demagnetizing field , excitation , laser , femtosecond pulse shaping , materials science , pulse (music) , magnetization , magnetization dynamics , ferromagnetism , atomic physics , optics , condensed matter physics , magnetic field , physics , quantum mechanics , detector

The laser-induced demagnetization of a ferromagnet is caused by the temperature of the electron gas as well as the lattice temperature. For long excitation pulses, the two reservoirs are in thermal equilibrium. In contrast to a picosecond laser pulse, a femtosecond pulse causes a non-equilibrium between the electron gas and the lattice. By pump pulse length dependent optical measurements, we find that the magnetodynamics in Ni caused by a picosecond laser pulse can be reconstructed from the response to a femtosecond pulse. The mechanism responsible for demagnetization on the picosecond time scale is therefore contained in the femtosecond demagnetization experiment

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