Authors:	Kerber, Nico Ksenzov, Dmitriy Freimuth, Frank Capotondi, Flavio Pedersoli, Emanuele Lopez-Quintas, Ignacio Seng, Boris Cramer, Joel Litzius, Kai Lacour, Daniel Zabel, Hartmut Mokrousov, Yuriy Kläui, Mathias Gutt, Christian
Title:	Faster chiral versus collinear magnetic order recovery after optical excitation revealed by femtosecond XUV scattering
Online publication date:	15-Jan-2021
Year of first publication:	2020
Language:	english
Abstract:	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 ultrafast 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 demagnetization we observe that the dichroic (CL-CR) signal connected with the chiral order correlator m(z)m(x) in the domain walls recovers significantly faster than the (CL+CR) sum signal representing the average collinear domain magnetization m(z)(2)+m(x)(2). We explore possible explanations based on spin structure dynamics and reduced transversal magnetization fluctuations inside the domain walls and find that the latter can explain the experimental data leading to different dynamics for collinear magnetic order and chiral magnetic order. Chiral spin structures have great promise for future information processing applications, however little is known about their ultrafast dynamics. In this experimental study, the authors use femtosecond temporal evolution to observe the fast recovery of chiral magnetic order.
DDC:	530 Physik 530 Physics
Institution:	Johannes Gutenberg-Universität Mainz
Department:	FB 08 Physik, Mathematik u. Informatik
Place:	Mainz
ROR:	https://ror.org/023b0x485
DOI:	http://doi.org/10.25358/openscience-5559
Version:	Published version
Publication type:	Zeitschriftenaufsatz
Document type specification:	Scientific article
License:	CC BY
Information on rights of use:	https://creativecommons.org/licenses/by/4.0/
Journal:	Nature communications 11
Pages or article number:	6304
Publisher:	Nature Publishing Group UK
Publisher place:	London
Issue date:	2020
ISSN:	2041-1723
Publisher URL:	https://doi.org/10.1038/s41467-020-19613-z
Publisher DOI:	10.1038/s41467-020-19613-z
Appears in collections:	JGU-Publikationen