Magnetic Vortex Dynamics Probed by Time-Resolved Magnetic Helicoidal Dichroism
The laser excitation of magnetization dynamics without applying external fields is a topic of high interest for its potential applications (e.g., magnetic memories, oscillators, and THz emitters). We explore the use of an ultrashort infrared laser pulse for triggering transient changes in a magnetic vortex, probing the induced dynamics by time-resolved magnetic helicoidal dichroism (MHD) in resonant extreme ultraviolet scattering. MHD describes the optical response of a magnetic sample upon sign reversal of either the light orbital angular momentum or the magnetization and was demonstrated to be sensitive to the sample spin texture. Here, we show that, in addition to the well-known ultrafast demagnetization and remagnetization laser-induced processes, the analysis of the MHD signal, supported by micromagnetic simulations, provides direct evidence of important transient reorganizations of the spin texture. In particular, we find that an ultrafast laser pulse of sufficient intensity can induce a surface transient magnetic texture where the vortex curling direction is reversed with respect to the bulk. This result provides insight into the preparation of metastable complex spin states in magnetic films by optical methods without applying an external field, which is of relevance for novel applications in data storage and manipulation.
Authors
- Carlo Spezzani (ORCID: https://orcid.org/0000-0001-5364-9047)
- Benedikt Rösner (ORCID: https://orcid.org/0000-0001-8765-5904)
- L. D. Buda-Prejbeanu (ORCID: https://orcid.org/0000-0002-6105-151X)
- Primož Rebernik Ribič (ORCID: https://orcid.org/0000-0002-5555-601X)
- Thierry Ruchon (ORCID: https://orcid.org/0000-0001-7933-8933)
- Christian Dávid (ORCID: https://orcid.org/0000-0002-2953-1265)
- Lucian Prejbeanu (ORCID: https://orcid.org/0000-0001-6577-032X)
- L. Vila (ORCID: https://orcid.org/0000-0002-1171-2391)
- Mauro Fanciulli (ORCID: https://orcid.org/0000-0002-7018-0110)
- Ricardo C. Sousa (ORCID: https://orcid.org/0000-0001-8903-3359)
- G. De Ninno (ORCID: https://orcid.org/0000-0002-4648-4413)
- Martin Luttmann (ORCID: https://orcid.org/0000-0002-0328-6564)
- Michele Manfredda (ORCID: https://orcid.org/0000-0002-1965-8350)
- Matthieu Guer (ORCID: https://orcid.org/0000-0002-7568-4932)
- David Bresteau (ORCID: https://orcid.org/0000-0003-1183-0483)
- Dario De Angelis (ORCID: https://orcid.org/0000-0001-9199-6373)
- Emanuele Pedersoli (ORCID: https://orcid.org/0000-0003-0572-6735)
- Anda Elena Stanciu (ORCID: https://orcid.org/0000-0002-8717-5596)
- M. Sacchi (ORCID: https://orcid.org/0000-0002-3205-0796)
- B. Diény (ORCID: https://orcid.org/0000-0002-0575-5301)
- Pietro Carrara (ORCID: https://orcid.org/0000-0002-1937-7591)
- Matteo Pancaldi (ORCID: https://orcid.org/0000-0002-4125-3157)
- Flavio Capotondi (ORCID: https://orcid.org/0000-0003-1980-6162)
- Arun Ravindran (ORCID: https://orcid.org/0000-0002-5528-9847)
Institutions
- Ca' Foscari University of Venice (IT)
- University of Nova Gorica (SI)
- Synchrotron soleil (FR)
- Paul Scherrer Institute (CH)
- Elettra-Sincrotrone Trieste S.C.p.A. (IT)
- Sorbonne Université (FR)
- Spintronique et Technologie des Composants (FR)
- CY Cergy Paris Université (FR)
- Laboratoire Interactions, Dynamiques et Lasers (FR)
- Laboratoire Médiations (FR)
- University of West Bohemia in Pilsen (CZ)
Publication Details
- Journal
- Physical Review Letters
- Published
- 2025-04-15
- DOI
- https://doi.org/10.1103/physrevlett.134.156701
- Citations
- 6
- Primary Topic
- Magnetic properties of thin films
- Type
- article
- Field-Weighted Citation Impact
- 7.48
Funders
- European Cooperation in Science and Technology
- Agence Nationale de la Recherche
- Indo-French Centre for the Promotion of Advanced Research
- Ministero dell’Istruzione, dell’Università e della Ricerca
- Javna Agencija za Raziskovalno Dejavnost RS
- Horizon 2020 Framework Programme
- H2020 European Research Council