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Nonreciprocal spin waves in a chiral antiferromagnet without the Dzyaloshinskii-Moriya interaction

Journal Article · · Physical Review B
 [1];  [2];  [3]
  1. Pohang Univ. of Science and Technology (Korea); DOE/OSTI
  2. Pohang Univ. of Science and Technology (Korea)
  3. Rutgers Univ., Piscataway, NJ (United States)
+ Show Author Affiliations

Nonreciprocal spin waves can facilitate the realization of spin-wave logic devices. It has been demonstrated that the nonreciprocity can emerge when an external magnetic field is applied to chiral magnets whose spin structures crucially depend on an asymmetric exchange interaction, that is, the Dzyaloshinskii-Moriya interaction (DMI). Here we demonstrate that the nonreciprocity can arise even without the DMI. We demonstrate this idea for the chiral antiferromagnet Ba2NbFe3Si2O14 whose DMI is very small and chiral spin structure arises mainly from the competition between symmetric exchange interactions. Here, we show that when an external magnetic field is applied, an asymmetric energy-gap shift occurs and the spin wave becomes nonreciprocal from the competition between symmetric exchange interactions and the external magnetic field.

Research Organization:
Rutgers Univ., Piscataway, NJ (United States)
Sponsoring Organization:
USDOE Office of Science (SC); National Research Foundation of Korea (NRF)
Grant/Contract Number:
FG02-07ER46382
OSTI ID:
1609839
Alternate ID(s):
OSTI ID: 1480895
Journal Information:
Physical Review B, Journal Name: Physical Review B Journal Issue: 18 Vol. 98; ISSN 2469-9950; ISSN PRBMDO
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (4)

SOS: symmetry-operational similarity journal October 2019
Spin-wave directional anisotropies in antiferromagnetic Ba 3 NbFe 3 Si 2 O 14 journal October 2019
Anisotropic-Exchange Magnets on a Triangular Lattice: Spin Waves, Accidental Degeneracies, and Dual Spin Liquids journal April 2019
Anisotropic-Exchange Magnets on a Triangular Lattice: Spin Waves, Accidental Degeneracies, and Dual Spin Liquids text January 2018

Figures / Tables (5)

FIG. 1(p. 2)figure FIG. 1
FIG. 2(p. 3)figure FIG. 2
FIG. 3(p. 5)figure FIG. 3
FIG. 4(p. 6)figure FIG. 4
FIG. 5(p. 6)figure FIG. 5

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Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
Dzyaloshinskii-Moriya interaction
antiferromagnets
chiral magnets
magnons
materials science
noncentrosymmetric materials
noncollinear magnets
physics
spin waves