Signatures of a liquid-crystal transition in spin-wave excitations of skyrmions
Abstract
AbstractUnderstanding the spin-wave excitations of chiral magnetic order, such as the skyrmion crystal (SkX), is of fundamental interest to confirm such exotic magnetic order. The SkX is realized by competing Dzyaloshinskii-Moriya and ferromagnetic-exchange interactions with a magnetic field or anisotropy. Here, we compute the dynamical spin structure factor, using Monte Carlo and spin dynamics simulations, extracting the spin-wave spectrum in the SkX, in the vicinity of the paramagnet to SkX transition. Inside the SkX, we find six spin-wave modes, which are supplemented by another mode originating from the ferromagnetic background. Above the critical temperature Ts for the skyrmion crystallization, we find a diffusive regime, reminiscent of the liquid-to-crystal transition, revealing that topological spin texture of skyrmionic character starts to develop above Ts as the precursor of the SkX. We discuss the opportunities for the detection of the spin waves of the SkX using inelastic-neutron-scattering experiments in manganite-iridate heterostructures.
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division
- OSTI Identifier:
- 1735393
- Alternate Identifier(s):
- OSTI ID: 1737490
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Published Article
- Journal Name:
- Communications Physics
- Additional Journal Information:
- Journal Name: Communications Physics Journal Volume: 3 Journal Issue: 1; Journal ID: ISSN 2399-3650
- Publisher:
- Springer Nature
- Country of Publication:
- United Kingdom
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; magnetic properties and materials; surfaces, interfaces and thin films
Citation Formats
Mohanta, Narayan, Christianson, Andrew D., Okamoto, Satoshi, and Dagotto, Elbio. Signatures of a liquid-crystal transition in spin-wave excitations of skyrmions. United Kingdom: N. p., 2020.
Web. doi:10.1038/s42005-020-00489-w.
Mohanta, Narayan, Christianson, Andrew D., Okamoto, Satoshi, & Dagotto, Elbio. Signatures of a liquid-crystal transition in spin-wave excitations of skyrmions. United Kingdom. https://doi.org/10.1038/s42005-020-00489-w
Mohanta, Narayan, Christianson, Andrew D., Okamoto, Satoshi, and Dagotto, Elbio. Fri .
"Signatures of a liquid-crystal transition in spin-wave excitations of skyrmions". United Kingdom. https://doi.org/10.1038/s42005-020-00489-w.
@article{osti_1735393,
title = {Signatures of a liquid-crystal transition in spin-wave excitations of skyrmions},
author = {Mohanta, Narayan and Christianson, Andrew D. and Okamoto, Satoshi and Dagotto, Elbio},
abstractNote = {AbstractUnderstanding the spin-wave excitations of chiral magnetic order, such as the skyrmion crystal (SkX), is of fundamental interest to confirm such exotic magnetic order. The SkX is realized by competing Dzyaloshinskii-Moriya and ferromagnetic-exchange interactions with a magnetic field or anisotropy. Here, we compute the dynamical spin structure factor, using Monte Carlo and spin dynamics simulations, extracting the spin-wave spectrum in the SkX, in the vicinity of the paramagnet to SkX transition. Inside the SkX, we find six spin-wave modes, which are supplemented by another mode originating from the ferromagnetic background. Above the critical temperature Ts for the skyrmion crystallization, we find a diffusive regime, reminiscent of the liquid-to-crystal transition, revealing that topological spin texture of skyrmionic character starts to develop above Ts as the precursor of the SkX. We discuss the opportunities for the detection of the spin waves of the SkX using inelastic-neutron-scattering experiments in manganite-iridate heterostructures.},
doi = {10.1038/s42005-020-00489-w},
journal = {Communications Physics},
number = 1,
volume = 3,
place = {United Kingdom},
year = {Fri Dec 11 00:00:00 EST 2020},
month = {Fri Dec 11 00:00:00 EST 2020}
}
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