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arXiv · 2108.07999

Magnetoelastic coupling enabled tunability of magnon spin current generation in 2D antiferromagnets

Nasim Bazazzadeh·Mohammad Hamdi·Sungjoon Park·Amin Khavasi·S. Majid Mohseni·Ali Sadeghi
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Abstract

We theoretically investigate the magnetoelastic coupling (MEC) and its effect on magnon transport in two-dimensional antiferromagnets with a honeycomb lattice. MEC coeffcient along with magnetic exchange parameters and spring constants are computed for monolayers of transition metal trichalcogenides with N\'eel order ($\text{MnPS}_3$ and $\text{VPS}_3$) and zigzag order ($\text{CrSiTe}_3$, $\text{NiPS}_3$ and $\text{NiPSe}_3$) by $ab$ $initio$ calculations. Using these parameters, we predict that the spin-Nernst coefficient is significantly enhanced due to magnetoelastic coupling. Our study shows that although Dzyaloshinskii-Moriya interaction can produce spin Nernst effect in these materials, other mechanisms such as magnon-phonon coupling should be taken into account. We also demonstrate that the magnetic anisotropy is an important factor for control of magnon-phonon hybridization and enhancement of the Berry curvature and thus the spin-Nernst coefficient. Our results pave the way towards gate tunable spin current generation in 2D magnets by SNE via electric field modulation of MEC and anisotropy.

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Nasim Bazazzadeh, Mohammad Hamdi, Sungjoon Park, Amin Khavasi, S. Majid Mohseni, Ali Sadeghi. 2021-08-18. Magnetoelastic coupling enabled tunability of magnon spin current generation in 2D antiferromagnets. https://doi.org/10.1103/physrevb.104.l180402

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