Abstract
We have studied the laser induced ultrafast quenching of Gd 4f magnetic order in ferrimagnetic Co100-xGdx alloys to highlight the role of the Co 3d–Gd 5d inter-atomic exchange coupling. We have taken advantage of the ultrashort soft X-ray pulses deliver by the femtoslicing beamline at the BESSY II synchrotron radiation source at the Helmholtz–Zentrum Berlin to perform element- and time-resolved X-ray Magnetic Circular Dichroism spectroscopy. Our results show that the laser induced quenching of Gd 4f magnetic order occurs on very different time-scales for the Co72Gd28, the Co77Gd23 and the Co79Gd21 alloys. Most of the magnetic moment losses occur within the first picosecond (ps) while the electron distribution is strongly out of equilibrium. After the equilibration of the electrons and lattice temperatures (t > 1 ps), the magnetic losses occur on slower rates that depend on the alloy composition: increasing the Co composition speeds up the demagnetization of Gd 4f sublattice. The strength of the Co 3d–Gd 5d inter-atomic exchange coupling which depends on composition, determines the efficiency of the angular momentum flow from the Gd 4f spin towards the lattice. Our results are in qualitative agreements with the predictions of the microscopic three temperatures model for ferrimagnetic alloys.
Similar content being viewed by others
Data availability
The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.
References
Mishra et al., IEEE Trans. Magn. 57, 0800134 (2021)
Beaurepaire et al., Phys. Rev. Lett 76, 4250 (1996)
Kirilyuk et al., Rev. Mod. Phys. 82, 2731 (2010)
Bigot et al., Ann. Phys. 525, 2 (2013)
Yang et al., Sci. Adv. 3, e1603117 (2017)
Ostler et al., Nat. Commun. 3, 666 (2012)
Lalieu et al., Phys. Rev. B 96, 220411(R) (2017)
Y. Xu et al., Adv. Mat. 29, 1703474 (2017)
Iihama et al., Adv. Mater. 30, 1804004 (2018)
Rémy et al., Adv. Sci. 200, 2020 (1996)
Iihama et al., J. Phys. Soc. Jpn. 90, 081009 (2021)
Wei et al., Phys. Rev. Appl. 15, 054065 (2021)
Radu et al., Nature 472, 205 (2011)
Lopez-Flores et al., Phys. Rev. B 87, 214412 (2013)
Bergeard et al., Nat. Commun. 5, 3466 (2014)
Radu et al., SPIN 5, 1550004 (2015)
Higley et al., Rev. Sci. Instrum. 87, 033110 (2016)
Hennecke et al., Phys. Rev. Lett. 122, 157202 (2019)
Wietstruk et al., Phys. Rev. Lett. 106, 127401 (2011)
Eschenlohr et al., Phys. Rev. B 89, 214423 (2014)
Chen et al., New J. Phys. 21, 123007 (2019)
Zhang et al., Phys. Rev. B 105, 054410 (2022)
Ren et al. arXiv:2012.14620 (2020)
Mekkonen et al., Phys. Rev. B. 87, 180406 (2013)
Atxitia et al., Phys. Rev. B 89, 224421 (2014)
Schellekens et al., Phys. Rev. B 87, 020407(R) (2013)
Tao et al., AIP Conf. Proc. 18, 641 (1974)
Hansen et al., J. Appl. Phys. 66, 756 (1989)
Koopmans et al., Nat. Mater. 9, 259 (2010)
Beens et al., Phys. Rev. B 100, 220409(R) (2019)
Bergeard et al., Phys. Rev. B. 96, 064418 (2017)
R. Abrudan et al., Rev. Sci. Instrum. 86, 063902 (2015)
R.C. Taylor et al., J. Appl. Phys. 47, 4666 (1976)
Holldack et al., J. Synchrotron Radiat. 21, 1090 (2014)
Stanciu et al., Phys. Rev. Lett. 99, 217204 (2007)
Ferté et al., J. Magn. Magn. Mat. 530, 167883 (2021)
Stanciu et al., Phys. Rev. B 73, 220402 (2006)
Binder et al., Phys. Rev. B 74, 134404 (2006)
Hopkins et al., J. Appl. Phys 111, 103533 (2012)
Kim et al., Appl. Phys. Lett. 94, 192506 (2009)
Jiao et al., IEEE Trans. Magn. 49, 3191 (2013)
Ren et al., SPIN 7, 1740003 (2017)
Li et al., Phys. Rev. B 97, 184432 (2018)
Khorsand et al., Phys. Rev. Lett. 110, 107205 (2013)
Ferté et al., Phys. Rev. B 96, 144427 (2017)
Abrudan et al., Phys. Status Solidi RRL. 15, 2100047 (2021)
Frietsch et al., Sci. Adv. 6, 1601 (2020)
Windsor et al. Nat. Mater. (2022)
Dornes et al., Nature 565, 209 (2019)
Ciuciulkaite et al., Phys. Rev. Mat. 4, 104418 (2020)
Fan et al., Optica. 9, 399 (2022)
Hennecke et al., Phys. Rev. Res. 4, L022062 (2022)
Acknowledgements
We are indebted for the scientific and technical support given by N. Pontius, Ch. Schüßler-Langeheine and R. Mitzner at the slicing facility at the BESSY II storage ring. The authors are grateful for financial support received from the following agencies: the French “Agence National de la Recherche” via Project No. ANR-11-LABX-0058_NIE and Project EQUIPEX UNION No. ANR-10-EQPX-52 and the EU Contract Integrated Infrastructure Initiative I3 in FP6 Project No. R II 3CT-2004-506008. This work was supported partly by the French PIA project “Lorraine Université d’Excellence”, reference ANR-15-IDEX-04-LUE, by the Project Plus cofounder by the “FEDER-FSE Lorraine et Massif Vosges 2014-2020”, a European Union Program and by the OVNI project from Region Grand-Est and by the MATELAS project institut Carnot ICEEL.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
About this article
Cite this article
Ferté, T., Beens, M., Malinowski, G. et al. Laser induced ultrafast Gd 4f spin dynamics in Co100-xGdx alloys by means of time-resolved XMCD. Eur. Phys. J. Spec. Top. 232, 2213–2219 (2023). https://doi.org/10.1140/epjs/s11734-023-00812-w
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1140/epjs/s11734-023-00812-w