Non-equilibrium self-assembly of spin-wave solitons in FePt nanoparticles
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 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.
Keywords
Cite
@article{arxiv.2111.01649,
title = {Non-equilibrium self-assembly of spin-wave solitons in FePt nanoparticles},
author = {D. Turenne and A. Yaroslavtsev and X. Wang and V. Unikandanuni and I. Vaskivskyi and M. Schneider and E. Jal and R. Carley and G. Mercurio and R. Gort and N. Agarwal and B. Van Kuiken and L. Mercadier and J. Schlappa and L. Le Guyader and N. Gerasimova and M. Teichmann and D. Lomidze and A. Castoldi and D. Potorochin and D. Mukkattukavil and J. Brock and N. Z. Hagström and A. H. Reid and X. Shen and X. J. Wang and P. Maldonado and Y. Kvashnin and K. Carva and J. Wang and Y. K. Takahashi and E. E. Fullerton and S. Eisebitt and P. M. Oppeneer and S. Molodtsov and A. Scherz and S. Bonetti and E. Iacocca and H. A. Dürr},
journal= {arXiv preprint arXiv:2111.01649},
year = {2021}
}
Comments
32 pages, please check the "attachemnts" tab in the pdf file in order to see the movie