Non-equilibrium self-assembly of spin-wave solitons in FePt nanoparticles

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 magneto-crystalline anisotropy. This in turn reduces the magnet...

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Bibliographic Details
Published in:arXiv.org 2021-11
Main Authors: Turenne, D, Yaroslavtsev, A, Wang, X, Unikandanuni, V, Vaskivskyi, I, Schneider, M, Jal, E, Carley, R, Mercurio, G, Gort, R, Agarwal, N, B Van Kuiken, Mercadier, L, Schlappa, J, L Le Guyader, Gerasimova, N, Teichmann, M, Lomidze, D, Castoldi, A, Potorochin, D, Mukkattukavil, D, Brock, J, Hagström, N Z, Reid, A H, Shen, X, Wang, X J, Maldonado, P, Kvashnin, Y, Carva, K, Wang, J, Takahashi, Y K, Fullerton, E E, Eisebitt, S, Oppeneer, P M, Molodtsov, S, Scherz, A, Bonetti, S, Iacocca, E, Dürr, H A
Format: Article
Language:English
Subjects:
Anisotropy
Bedrock
Data storage
Electrons
Excitation
Intermetallic compounds
Iron compounds
Nanoparticles
Platinum compounds
Self-assembly
Solitary waves
Spin dynamics
Wave diffraction
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Summary: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 magneto-crystalline 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 miniature devices capable of filling the THz gap.
ISSN:2331-8422