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

Diego Turenne, Alexander Yaroslavtsev, Xiaocui Wang, Vivek Unikandanuni, Igor Vaskivskyi, Michael Schneider, Emmanuelle Jal, Robert Carley, Guiseppe Mercurio, Rafael Gort, Naman Agarwal, Benjamin Van Kuiken, Laurent Mercadier, Justine Schlappa, Loïc Le Guyader, Natalia Gerasimova, Martin Teichmann, David Lomidze, Andrea Castoldi, Dimitri PotorochinDeepak Mukkattukavil, Jeffrey Brock, Nanna Zhou Hagström, Alexander H. Reid, Xiaozhe Shen, Xijie J. Wang, Pablo Maldonado, Yaroslav Kvashnin, Karel Carva, Jian Wang, Yukiko K. Takahashi, Eric E. Fullerton, Stefan Eisebitt, Peter M. Oppeneer, Serguei Molodtsov, Andreas Scherz, Stefano Bonetti, Ezio Iacocca, Hermann A. Dürr*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageEnglish
Article number0523
JournalScience Advances
Volume8
Issue number13
DOIs
Publication statusPublished - 2022 Apr
Externally publishedYes

ASJC Scopus subject areas

  • General

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