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Title: 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 » or insulating.« less

Authors:
 [1];  [2];  [3];  [1]
  1. Univ. of Tokyo (Japan). Dept. of Applied Physics
  2. Hokkaido Univ., Sapporo (Japan). Dept. of Physics
  3. 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. doi: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. doi: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 = {2017},
month = {9}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Citation Metrics:
Cited by: 4 works
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Figures / Tables:

FIG. 1 FIG. 1: (Color online) (a) Real-space distribution of the staggered magnetization M$s\atop{i}$ obtained by the modified KPM-LD simulation for the Kondo lattice model on the square lattice at µ = 0 (n ∼ 0.5), J = 0.2, D = 0.005, and N = 1202. (b) Bare susceptibility χ$0\atop{q}$ at µmore » = 0 in the momentum space. The black square represents the 1st BZ. The arrows A and B denote the cuts along which we evaluate the second derivative of χ$0\atop{q}$; see Sec. IV for details.« less

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    Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.