TY - JOUR
T1 - Nonequilibrium sub–10 nm spin-wave soliton formation in FePt nanoparticles
AU - Turenne, Diego
AU - Yaroslavtsev, Alexander
AU - Wang, Xiaocui
AU - Unikandanuni, Vivek
AU - Vaskivskyi, Igor
AU - Schneider, Michael
AU - Jal, Emmanuelle
AU - Carley, Robert
AU - Mercurio, Guiseppe
AU - Gort, Rafael
AU - Agarwal, Naman
AU - Van Kuiken, Benjamin
AU - Mercadier, Laurent
AU - Schlappa, Justine
AU - Le Guyader, Loïc
AU - Gerasimova, Natalia
AU - Teichmann, Martin
AU - Lomidze, David
AU - Castoldi, Andrea
AU - Potorochin, Dimitri
AU - Mukkattukavil, Deepak
AU - Brock, Jeffrey
AU - Hagström, Nanna Zhou
AU - Reid, Alexander H.
AU - Shen, Xiaozhe
AU - Wang, Xijie J.
AU - Maldonado, Pablo
AU - Kvashnin, Yaroslav
AU - Carva, Karel
AU - Wang, Jian
AU - Takahashi, Yukiko K.
AU - Fullerton, Eric E.
AU - Eisebitt, Stefan
AU - Oppeneer, Peter M.
AU - Molodtsov, Serguei
AU - Scherz, Andreas
AU - Bonetti, Stefano
AU - Iacocca, Ezio
AU - Dürr, Hermann A.
N1 - Funding Information:
We acknowledge the European XFEL in Schenefeld, Germany, for provision of x-ray free-electron laser beam time at Scientific Instrument SCS and thank the instrument group and facility staff for their assistance. D.T., X.W., and H.A.D. acknowledge support from the Swedish Research Council (VR), grants 2017-06711 and 2018-04918. A.Y. acknowledges support from the Carl Trygger Foundation. V.U., N.Z.H., and S.B. acknowledge support from the European Research Council, Starting Grant 715452 Magnetic-Speed-Limit. E.J. is grateful for the financial support received from the CNRS-Momentum program. K.C. acknowledges support from the Czech Science Foundation (grant no. 19-13659S). P.M.O. acknowledges support by the Swedish Research Council (VR). Part of the calculations were enabled by resources provided by the Swedish National Infrastructure for Computing (SNIC) at NSC Linköping, partially funded by VR through grant agreement no. 2018-05973. Y.K. acknowledges the financial support from VR (grant 2019-03569) and Göran Gustafsson Foundation. J.B. and E.E.F. acknowledge support by the U.S. Department of Energy (DOE), Office of Science, Office of Basic Energy Sciences (BES) under the X-Ray Scattering Program award number DE-SC0017643. Work at the SLAC MeV-UED is supported in part by the DOE BES SUF Division Accelerator and Detector R&D program, the LCLS Facility, and SLAC under contract nos. DE-AC02-05-CH11231 and DE-AC02-76SF00515. Author contributions: XFEL measurements: D.T., A.Y., X.W., V.U., I.V., M.S., E.J., R.C., G.M., R.G., N.A., B.V.K., L.M., J.S., L.L.G., N.G., M.T., A.C., D.L., D.P., D.M., J.B., N.Z.H., E.E.F., S.E., S.M., A.S., S.B., and H.A.D. UED measurements: D.T., I.V., A.H.R., X.S., X.J.W., and H.A.D. Sample growth and characterization: J.W. and Y.K.T. Micromagnetic simulations: E.I. Magnetoelastic calculations: A.Y. Ab initio calculations: P.M., Y.K., K.C., and P.M.O. Data analysis: D.T., A.Y., X.W., I.V., M.S., E.I., S.B., and H.A.D. Writing (original draft): D.T., A.Y., X.W., E.I., S.B., and H.A.D. Writing (review and editing): All authors. Competing interests: The authors declare that they have no financial or other competing interests. Data and materials availability: All data needed to evaluate the conclusions in the paper are present in the paper and/or the Supplementary Materials. Raw data generated at the European XFEL large-scale facility are available at DOI: 10.22003/ XFEL.EU-DATA-002599-00.
Publisher Copyright:
© 2022 The Authors
PY - 2022/4
Y1 - 2022/4
N2 - Magnetic nanoparticles such as FePt in the L10 phase are the bedrock of our current data storage technology. As the grains become smaller to keep up with technological demands, the superparamagnetic limit calls for materials with higher magnetocrystalline anisotropy. This, in turn, reduces the magnetic exchange length to just a few nanometers, enabling magnetic structures to be induced within the nanoparticles. Here, we describe the existence of spin-wave solitons, dynamic localized bound states of spin-wave excitations, in FePt nanoparticles. We show with time-resolved x-ray diffraction and micromagnetic modeling that spin-wave solitons of sub–10 nm sizes form out of the demagnetized state following femtosecond laser excitation. The measured soliton spin precession frequency of 0.1 THz positions this system as a platform to develop novel miniature devices.
AB - Magnetic nanoparticles such as FePt in the L10 phase are the bedrock of our current data storage technology. As the grains become smaller to keep up with technological demands, the superparamagnetic limit calls for materials with higher magnetocrystalline anisotropy. This, in turn, reduces the magnetic exchange length to just a few nanometers, enabling magnetic structures to be induced within the nanoparticles. Here, we describe the existence of spin-wave solitons, dynamic localized bound states of spin-wave excitations, in FePt nanoparticles. We show with time-resolved x-ray diffraction and micromagnetic modeling that spin-wave solitons of sub–10 nm sizes form out of the demagnetized state following femtosecond laser excitation. The measured soliton spin precession frequency of 0.1 THz positions this system as a platform to develop novel miniature devices.
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U2 - 10.1126/sciadv.abn0523
DO - 10.1126/sciadv.abn0523
M3 - Article
C2 - 35363518
AN - SCOPUS:85127511489
SN - 2375-2548
VL - 8
JO - Science advances
JF - Science advances
IS - 13
M1 - 0523
ER -