Magnon dispersion relations in the noncollinear antiferromagnet<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>IrMn</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math>

Rezende, S. M.; Mendes, J. B. S.; Maior, D. S.; Abrão, J. E.; Azevedo, A.; Rodrı́guez-Suárez, R. L.

doi:10.1103/physrevb.102.054435

Cited by 3 publications

(13 citation statements)

References 45 publications

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“…We emphasize that these interesting features have been demonstrated for model systems only. The exploration of these effects in noncollinear antiferromagnets of current interest for spintronics, such as IrMn 3 (Rezende et al, 2020) or SnMn 3 , is highly desired.…”

Section: Magnonic Spin Nernst Effectmentioning

confidence: 99%

Topological aspects of antiferromagnets

Bonbien

Zhuo²,

Salimath³

et al. 2021

J. Phys. D: Appl. Phys.

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The long fascination that antiferromagnetic materials has exerted on the scientific community over about a century has been entirely renewed recently with the discovery of several unexpected phenomena, including various classes of anomalous spin and charge Hall effects and unconventional magnonic transport, and also homochiral magnetic entities such as skyrmions. With these breakthroughs, antiferromagnets stand out as a rich playground for the investigation of novel topological behavior, and as promising candidate materials for disruptive low-power microelectronic applications. Remarkably, the newly discovered phenomena are all related to the topology of the magnetic, electronic or magnonic ground state of the antiferromagnets. This review exposes how non-trivial topology emerges at different levels in antiferromagnets and explores the novel mechanisms that have been discovered recently. We also discuss how novel classes of quantum magnets could enrich the currently expanding field of antiferromagnetic spintronics and how spin transport can in turn favor a better understanding of exotic quantum excitations.

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Section: Magnonic Spin Nernst Effectmentioning

confidence: 99%

Topological aspects of antiferromagnets

Bonbien

Zhuo²,

Salimath³

et al. 2021

J. Phys. D: Appl. Phys.

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“…Among the AF systems with kagome spin structures there are several compounds with the jarosite crystal structure [17], pyrochlore oxides with all-in-all-out magnetic order [18][19][20], and noncollinear chiral AFs of the Mn 3 X (X = Sn, Ge, Ga, Ir, Pt, Rh) family [21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38]. In all these systems, the macroscopic degeneracy of the 120 • structure is lifted by some type of magnetic anisotropy, such as single-ion, magnetic dipole-dipole, or Dzyaloshinskii-Moriya interaction.…”

Section: Introductionmentioning

confidence: 99%

“…In all these systems, the macroscopic degeneracy of the 120 • structure is lifted by some type of magnetic anisotropy, such as single-ion, magnetic dipole-dipole, or Dzyaloshinskii-Moriya interaction. As a result, all k = 0 magnon modes have nonzero energy that can be measured by various techniques, such as sub-terahertz AF resonance, Brillouin and Raman light scattering [32]. In addition, twomagnon Raman scattering can be used to measure the frequency of pairs of zone boundary magnons [19,32].…”

Section: Introductionmentioning

confidence: 99%

“…As a result, all k = 0 magnon modes have nonzero energy that can be measured by various techniques, such as sub-terahertz AF resonance, Brillouin and Raman light scattering [32]. In addition, twomagnon Raman scattering can be used to measure the frequency of pairs of zone boundary magnons [19,32]. These techniques have a big advantage over inelastic neutron scattering because they can be implemented in small size equipment in research laboratories.…”

Section: Introductionmentioning

confidence: 99%

“…These techniques have a big advantage over inelastic neutron scattering because they can be implemented in small size equipment in research laboratories. One difficulty for a direct interpretation of the measured magnon frequencies is that due to the complex spin structures, the spin wave calculations for these materials are carried out by numerical procedures [28,31,32]. In this paper we present a spin-wave calculation for kagome AFs with exchange and single-ion anisotropy interactions that yield exact analytical expressions for the frequencies of magnons at high-symmetry point of the Brillouin zone, that can be readily use to obtain the interaction parameters from experimental data.…”

Section: Introductionmentioning

confidence: 99%

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Analytical solutions for the magnon frequencies at high-symmetry points of the Brillouin zone in anisotropic kagome antiferromagnets

Rodrı́guez-Suárez¹,

Rezende²

2021

J. Phys.: Condens. Matter

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The knowledge of the magnon dispersion relations in antiferromagnetic materials with nontrivial spin textures has considerable interest to the understanding of magnonic and spintronic phenomena involving these materials. One particularly interesting nontrivial spin texture existing in several antiferromagnets has spins at an angle of 120 • with the in-plane neighbors and arranged in kagome lattices. Here we present a spin-wave calculation for antiferromagnets with kagome spin lattices considering exchange and single-ion anisotropy interactions between the spins. The theory yields exact analytical expressions for the frequencies of magnons at high-symmetry points of the Brillouin zone, that can be readily use to obtain the interaction parameters from experimental data with one-and two-magnon inelastic light scattering. The analytical expressions are used to obtain the field parameters for the kagome lattice antiferromagnet L1 2 -IrMn 3 from four experimentally measured frequencies. Both exchange field parameters are in reasonable agreement with the values obtained with ab initio calculations, while the anisotropy field is in very good agreement with the one calculated with atomistic spin models and Monte Carlo simulations.

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