Normal modes of a spin cycloid or helix
Abstract
Although spin cycloids and helices are quite common, remarkably little is known about the normal modes of a spin cycloid or helix with finite length on a discrete lattice. Based on simple one-dimensional lattice models, we numerically evaluate the normal modes of a spin cycloid or helix produced by either Dzyaloshinskii-Moriya (DM) or competing exchange (CE) interactions. The normal modes depend on the type of interaction and on whether the nearest-neighbor exchange is antiferromagnetic (AF) or ferromagnetic (FM). In the AF/DM and FM/DM cases, there is only a single Goldstone mode; in the AF/CE and FM/CE cases, there are three. For FM exchange, the spin oscillations produced by non-Goldstone modes contain a mixture of tangential and transverse components. For the DM cases, we compare our numerical results with analytic results in the continuum limit. Examples are given of materials that fall into all four cases.
- Authors:
-
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division
- National Inst. of Chemical Physics and Biophysics, Tallinn (Estonia)
- Univ. of Victoria, BC (Canada)
- 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)
- OSTI Identifier:
- 1559728
- Alternate Identifier(s):
- OSTI ID: 1494655
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review B
- Additional Journal Information:
- Journal Volume: 99; Journal Issue: 6; Journal ID: ISSN 2469-9950
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Citation Formats
Fishman, Randy S., Rõõm, Toomas, and de Sousa, Rogério. Normal modes of a spin cycloid or helix. United States: N. p., 2019.
Web. doi:10.1103/PhysRevB.99.064414.
Fishman, Randy S., Rõõm, Toomas, & de Sousa, Rogério. Normal modes of a spin cycloid or helix. United States. https://doi.org/10.1103/PhysRevB.99.064414
Fishman, Randy S., Rõõm, Toomas, and de Sousa, Rogério. Wed .
"Normal modes of a spin cycloid or helix". United States. https://doi.org/10.1103/PhysRevB.99.064414. https://www.osti.gov/servlets/purl/1559728.
@article{osti_1559728,
title = {Normal modes of a spin cycloid or helix},
author = {Fishman, Randy S. and Rõõm, Toomas and de Sousa, Rogério},
abstractNote = {Although spin cycloids and helices are quite common, remarkably little is known about the normal modes of a spin cycloid or helix with finite length on a discrete lattice. Based on simple one-dimensional lattice models, we numerically evaluate the normal modes of a spin cycloid or helix produced by either Dzyaloshinskii-Moriya (DM) or competing exchange (CE) interactions. The normal modes depend on the type of interaction and on whether the nearest-neighbor exchange is antiferromagnetic (AF) or ferromagnetic (FM). In the AF/DM and FM/DM cases, there is only a single Goldstone mode; in the AF/CE and FM/CE cases, there are three. For FM exchange, the spin oscillations produced by non-Goldstone modes contain a mixture of tangential and transverse components. For the DM cases, we compare our numerical results with analytic results in the continuum limit. Examples are given of materials that fall into all four cases.},
doi = {10.1103/PhysRevB.99.064414},
journal = {Physical Review B},
number = 6,
volume = 99,
place = {United States},
year = {Wed Feb 13 00:00:00 EST 2019},
month = {Wed Feb 13 00:00:00 EST 2019}
}
Web of Science
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