Shape of magnetic domain walls formed by coupling to mobile charges
Abstract
Magnetic domain walls, which are crucially important in both fundamental physics and technical applications, often have a preference in their form due to many different origins, such as the crystalline shape, lattice symmetry, and magnetic anisotropy. Here we theoretically investigate yet another origin stemming from the coupling to mobile charges in itinerant magnets. Performing a large-scale numerical simulation in a minimal model for itinerant magnets, i.e., the Kondo lattice model with classical localized spins, we show that the shape of magnetic domain walls depends on the electronic band structure and electron filling. While Néel and 120° antiferromagnetic states do not show a strong preference in the shape of domain walls, noncoplanar spin states with scalar chiral ordering have distinct directional preferences of the domain walls depending on the electron filling. We find that the directional preference is rationalized by the wave-number dependence of the effective magnetic interactions induced by the mobile charges, which are set by the band structure and electron filling. Finally, we also observe that, in the noncoplanar chiral states, an electric current is induced along the domain walls owing to the spin Berry phase mechanism, with different spatial distributions depending on whether the bulk state is metallicmore »
- Authors:
-
- Univ. of Tokyo (Japan). Dept. of Applied Physics
- Hokkaido Univ., Sapporo (Japan). Dept. of Physics
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Publication Date:
- Research Org.:
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Univ. of Tokyo (Japan); Hokkaido Univ., Sapporo (Japan)
- Sponsoring Org.:
- USDOE; LANL Laboratory Directed Research and Development (LDRD) Program; Japan Society for the Promotion of Science (JSPS); Ministry of Education, Culture, Sports, Science and Technology (MEXT) (Japan)
- OSTI Identifier:
- 1485400
- Alternate Identifier(s):
- OSTI ID: 1390653
- Report Number(s):
- LA-UR-16-27230
Journal ID: ISSN 2469-9950
- Grant/Contract Number:
- AC52-06NA25396; 24340076
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review B
- Additional Journal Information:
- Journal Volume: 96; Journal Issue: 9; Journal ID: ISSN 2469-9950
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; domain walls; magnetic domains; magnetism; Kondo lattice model; Landau-Lifshitz model; Langevin algorithm
Citation Formats
Ozawa, Ryo, Hayami, Satoru, Barros, Kipton, and Motome, Yukitoshi. Shape of magnetic domain walls formed by coupling to mobile charges. United States: N. p., 2017.
Web. doi:10.1103/PhysRevB.96.094417.
Ozawa, Ryo, Hayami, Satoru, Barros, Kipton, & Motome, Yukitoshi. Shape of magnetic domain walls formed by coupling to mobile charges. United States. https://doi.org/10.1103/PhysRevB.96.094417
Ozawa, Ryo, Hayami, Satoru, Barros, Kipton, and Motome, Yukitoshi. Fri .
"Shape of magnetic domain walls formed by coupling to mobile charges". United States. https://doi.org/10.1103/PhysRevB.96.094417. https://www.osti.gov/servlets/purl/1485400.
@article{osti_1485400,
title = {Shape of magnetic domain walls formed by coupling to mobile charges},
author = {Ozawa, Ryo and Hayami, Satoru and Barros, Kipton and Motome, Yukitoshi},
abstractNote = {Magnetic domain walls, which are crucially important in both fundamental physics and technical applications, often have a preference in their form due to many different origins, such as the crystalline shape, lattice symmetry, and magnetic anisotropy. Here we theoretically investigate yet another origin stemming from the coupling to mobile charges in itinerant magnets. Performing a large-scale numerical simulation in a minimal model for itinerant magnets, i.e., the Kondo lattice model with classical localized spins, we show that the shape of magnetic domain walls depends on the electronic band structure and electron filling. While Néel and 120° antiferromagnetic states do not show a strong preference in the shape of domain walls, noncoplanar spin states with scalar chiral ordering have distinct directional preferences of the domain walls depending on the electron filling. We find that the directional preference is rationalized by the wave-number dependence of the effective magnetic interactions induced by the mobile charges, which are set by the band structure and electron filling. Finally, we also observe that, in the noncoplanar chiral states, an electric current is induced along the domain walls owing to the spin Berry phase mechanism, with different spatial distributions depending on whether the bulk state is metallic or insulating.},
doi = {10.1103/PhysRevB.96.094417},
journal = {Physical Review B},
number = 9,
volume = 96,
place = {United States},
year = {Fri Sep 15 00:00:00 EDT 2017},
month = {Fri Sep 15 00:00:00 EDT 2017}
}
Web of Science
Figures / Tables:
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