Nonequilibrium sub–10 nm spin-wave soliton formation in FePt nanoparticles

Turenne, Diego, Yaroslavtsev, Alexander, Wang, Xiaocui, Unikandanuni, Vivek, Vaskivskyi, Igor, Schneider, Michael, Jal, Emmanuelle, Carley, Robert, Mercurio, Guiseppe, Gort, Rafael, Agarwal, Naman, Van Kuiken, Benjamin, Mercadier, Laurent, Schlappa, Justine, Le Guyader, Loïc, Gerasimova, Natalia, Teichmann, Martin, Lomidze, David, Castoldi, Andrea, Potorochin, Dimitri, Mukkattukavil, Deepak, Brock, Jeffrey, Zhou Hagström, Nanna, Reid, Alexander H., Shen, Xiaozhe, Wang, Xijie J., Maldonado, Pablo, Kvashnin, Yaroslav, Carva, Karel, Wang, Jian, Takahashi, Yukiko K., Fullerton, Eric E., Eisebitt, Stefan, Oppeneer, Peter M., Molodtsov, Serguei, Scherz, Andreas, Bonetti, Stefano, Iacocca, Ezio and Dürr, Hermann A. (2022) Nonequilibrium sub–10 nm spin-wave soliton formation in FePt nanoparticles. Science Advances, 8 (13). eabn0523. ISSN 2375-2548

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Magnetic nanoparticles such as FePt in the L1 0 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.

Item Type: Article
Additional Information: 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.
Subjects: F300 Physics
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: Rachel Branson
Date Deposited: 11 Apr 2022 10:22
Last Modified: 11 Apr 2022 10:30

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