Chiral versus collinear magnetic order dynamics: faster chiral recovery after optical excitation revealed by femtosecond XUV scattering - Archive ouverte HAL Accéder directement au contenu
Pré-Publication, Document De Travail Année : 2020

Chiral versus collinear magnetic order dynamics: faster chiral recovery after optical excitation revealed by femtosecond XUV scattering

Nico Kerber
  • Fonction : Auteur
Dmitriy Ksenzov
  • Fonction : Auteur
Frank Freimuth
  • Fonction : Auteur
Flavio Capotondi
  • Fonction : Auteur
Emanuele Pedersoli
Boris Seng
  • Fonction : Auteur
Joel Cramer
  • Fonction : Auteur
Kai Litzius
  • Fonction : Auteur
Daniel Lacour
Hartmut Zabel
  • Fonction : Auteur
Yuriy Mokrousov
  • Fonction : Auteur
Christian Gutt
  • Fonction : Auteur
  • PersonId : 1059297

Résumé

While chiral spin structures stabilized by Dzyaloshinskii-Moriya interaction (DMI) are candidates as novel information carriers, their dynamics on the fs-ps timescale is little known. Since with the bulk Heisenberg exchange and the interfacial DMI two distinct exchange mechanisms are at play, the ultra-fast dynamics of the chiral order needs to be ascertained and compared to the dynamics of the conventional collinear order. Using an XUV free-electron laser we determine the fs-ps temporal evolution of the chiral order in domain walls in a magnetic thin film sample by an IR pump-X-ray magnetic scattering probe experiment. Upon demagnetisation we observe that the dichroic (CL-CR) signal from the chiral order in the domain walls recovers significantly faster than the (CL+CR) sum signal from the average collinear domain magnetisation. We explore possible explanations based on spin structure dynamics and reduced transversal magnetisation fluctuations inside the domain walls and find that the latter can explain the experimental data leading to distinctly different dynamics for collinear magnetic order and chiral magnetic order.
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Dates et versions

hal-03001243 , version 1 (12-11-2020)

Identifiants

  • HAL Id : hal-03001243 , version 1

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Nico Kerber, Dmitriy Ksenzov, Frank Freimuth, Flavio Capotondi, Emanuele Pedersoli, et al.. Chiral versus collinear magnetic order dynamics: faster chiral recovery after optical excitation revealed by femtosecond XUV scattering. 2020. ⟨hal-03001243⟩
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