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

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

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 bet...

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Main Authors: A. Fognini, G. Salvatella, R. Gort, T. Michlmayr, A. Vaterlaus, Y. Acremann
Format: Article
Language:English
Published: AIP Publishing LLC and ACA 2015-03-01
Series:Structural Dynamics
Online Access:http://dx.doi.org/10.1063/1.4914891
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spelling doaj-0b7a56480fad44a49410229a2707c1942020-11-24T22:40:09ZengAIP Publishing LLC and ACAStructural Dynamics2329-77782015-03-0122024501024501-610.1063/1.4914891004502SDYThe influence of the excitation pulse length on ultrafast magnetization dynamics in nickelA. Fognini0G. Salvatella1R. Gort2T. Michlmayr3A. Vaterlaus4Y. Acremann5Laboratory for Solid State Physics, Otto-Stern-Weg 1, ETH Zurich, 8093 Zurich, SwitzerlandLaboratory for Solid State Physics, Otto-Stern-Weg 1, ETH Zurich, 8093 Zurich, SwitzerlandLaboratory for Solid State Physics, Otto-Stern-Weg 1, ETH Zurich, 8093 Zurich, SwitzerlandLaboratory for Solid State Physics, Otto-Stern-Weg 1, ETH Zurich, 8093 Zurich, SwitzerlandLaboratory for Solid State Physics, Otto-Stern-Weg 1, ETH Zurich, 8093 Zurich, SwitzerlandLaboratory for Solid State Physics, Otto-Stern-Weg 1, ETH Zurich, 8093 Zurich, SwitzerlandThe 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.http://dx.doi.org/10.1063/1.4914891
collection DOAJ
language English
format Article
sources DOAJ
author A. Fognini
G. Salvatella
R. Gort
T. Michlmayr
A. Vaterlaus
Y. Acremann
spellingShingle A. Fognini
G. Salvatella
R. Gort
T. Michlmayr
A. Vaterlaus
Y. Acremann
The influence of the excitation pulse length on ultrafast magnetization dynamics in nickel
Structural Dynamics
author_facet A. Fognini
G. Salvatella
R. Gort
T. Michlmayr
A. Vaterlaus
Y. Acremann
author_sort A. Fognini
title The influence of the excitation pulse length on ultrafast magnetization dynamics in nickel
title_short The influence of the excitation pulse length on ultrafast magnetization dynamics in nickel
title_full The influence of the excitation pulse length on ultrafast magnetization dynamics in nickel
title_fullStr The influence of the excitation pulse length on ultrafast magnetization dynamics in nickel
title_full_unstemmed The influence of the excitation pulse length on ultrafast magnetization dynamics in nickel
title_sort influence of the excitation pulse length on ultrafast magnetization dynamics in nickel
publisher AIP Publishing LLC and ACA
series Structural Dynamics
issn 2329-7778
publishDate 2015-03-01
description 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.
url http://dx.doi.org/10.1063/1.4914891
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