Valley-polarized domain wall magnons in 2D ferromagnetic bilayers

Ghader, Doried

doi:10.1038/s41598-020-74047-3

Cited by 15 publications

(6 citation statements)

References 62 publications

(108 reference statements)

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“…A non-trivial Berry curvature is also at the origin of the magnon valley transports that were recently reported in Ref. [45,46]. For the dipolar honeycomb lattice, a topological phase transition occurs at Ψ = 0 where the spin gap closes at the Dirac points and C V changes sign.…”

Section: Discussionsupporting

confidence: 61%

Dipolar spin-waves and tunable band gap at the Dirac points in the 2D magnet ErBr3

Wessler,

Roessli,

Krämer

et al. 2022

Preprint

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Topological magnon insulators constitute a growing field of research for their potential use as information carriers without heat dissipation. We report an experimental and theoretical study of the magnetic ground-state and excitations in the van der Waals two-dimensional honeycomb magnet ErBr 3 . We show that the magnetic properties of this compound are entirely governed by the dipolar interactions which generate a continuously degenerate non-collinear ground-state on the honeycomb lattice with spins confined in the plane. We find that the magnon dispersion exhibits Dirac-like cones when the magnetic moments in the ground-state are related by timereversal and inversion symmetries associated with a Berry phase π as in single-layer graphene. A magnon band gap opens when the dipoles are rotated away from this state, entailing a finite Berry curvature in the vicinity of the K and K' Dirac points.Our results illustrate that the spin-wave dispersion of dipoles on the honeycomb lattice can be reversibly controlled from a magnetic phase with Dirac cones to a topological antiferromagnetic insulator with non-trivial valley Chern number.

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Section: Discussionsupporting

confidence: 61%

Dipolar spin-waves and tunable band gap at the Dirac points in the 2D magnet ErBr3

Wessler,

Roessli,

Krämer

et al. 2022

Preprint

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show abstract

“…The momentum-space Landau–Lifshitz equations of motion are obtained by applying the Fourier transform to the equations while keeping only linear terms in and . ,,,, For the A sublattice in layer 1 (sublattice A 1 ), we arrive at two equations and …”

Section: Resultsmentioning

confidence: 99%

“…Topological magnons are interesting due to their exotic features and great potential for practical applications in magnonics. − ,− One of the primary research directions in magnonics is to propagate magnons over a long distance . Edge and domain wall (DW) magnons in topological 2D magnets can form ideal 1D waveguides for long-range and coherent magnon transport since they are robust against disorder. ,,− In addition, topological 2D magnets display finite magnon Hall and Nernst conductivities that can be harnessed in ultrathin thermal magnonic devices. ,− Theoretical studies recently proposed routes to control topological magnons in 2D magnets via experimentally tunable parameters such as interlayer exchange, magnetic order, external magnetic field, electrostatic doping, and twisting. ,, The potential of 2D magnets to realize magnon valleytronics was also discussed in recent theoretical studies. ,− …”

Section: Introductionmentioning

confidence: 99%

Theoretical Study of Magnon Spin Currents in Chromium Trihalide Hetero-bilayers: Implications for Magnonic and Spintronic Devices

Ghader

Gao

Radaelli

et al. 2022

ACS Appl. Nano Mater.

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The intriguing magnetic behavior of two-dimensional chromium trihalide materials holds great promises for spintronics and magnonics. Here, we study the stacking-dependent magnetism in (CrBr /CrI ) 3 3 hetero-bilayers by using first-principles calculations. We find that different stackings yield ferromagnetic ground states or favor an antiferromagnetic (AFM) interlayer coupling. Starting from ab initio results, we study the magnonic spectra and magnon spin textures in the hetero-bilayer. Based on our findings, we propose an experimental setup for the optical generation and electric detection of pure magnon spin currents in layered AFM (LAFM) (CrBr /CrI ) 3 3 hetero-bilayers. Furthermore, we propose a device to simultaneously realize magnon spin currents and topological domain walls in the hetero-bilayers. The advantages of (CrBr /CrI ) 3 3 hetero-bilayers over the (CrI )3 2 homo-bilayers to realize magnon spin currents are highlighted. The interesting features of magnons in LAFM heterobilayers and their potential for spin-charge conversion could pave the way for their implementation in spin-based transistors and logic devices.

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“…A non-trivial Berry curvature is also at the origin of the magnon valley transports that were recently reported in refs. 45,46 . For the dipolar honeycomb lattice, a topological phase transition occurs at Ψ = 0 where the spin gap closes at the Dirac points and C V changes sign.…”

Section: Discussionmentioning

confidence: 99%

Dipolar spin-waves and tunable band gap at the Dirac points in the 2D magnet ErBr3

et al. 2022

View full text Add to dashboard Cite

Topological magnon insulators constitute a growing field of research for their potential use as information carriers without heat dissipation. We report an experimental and theoretical study of the magnetic ground-state and excitations in the van der Waals two-dimensional honeycomb magnet ErBr3. We show that the magnetic properties of this compound are entirely governed by the dipolar interactions which generate a continuously degenerate non-collinear ground-state on the honeycomb lattice with spins confined in the plane. We find that the magnon dispersion exhibits Dirac-like cones when the magnetic moments in the ground-state are related by time-reversal and inversion symmetries associated with a Berry phase π as in single-layer graphene. A magnon band gap opens when the dipoles are rotated away from this state, entailing a finite Berry curvature in the vicinity of the K and K’ Dirac points. Our results illustrate that the spin-wave dispersion of dipoles on the honeycomb lattice can be reversibly controlled from a magnetic phase with Dirac cones to a topological antiferromagnetic insulator with non-trivial valley Chern number.

show abstract

Valley-polarized domain wall magnons in 2D ferromagnetic bilayers

Cited by 15 publications

References 62 publications

Dipolar spin-waves and tunable band gap at the Dirac points in the 2D magnet ErBr3

Dipolar spin-waves and tunable band gap at the Dirac points in the 2D magnet ErBr3

Theoretical Study of Magnon Spin Currents in Chromium Trihalide Hetero-bilayers: Implications for Magnonic and Spintronic Devices

Dipolar spin-waves and tunable band gap at the Dirac points in the 2D magnet ErBr3

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