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    Crossover from Diffusive to Superfluid Transport in Frustrated Magnets

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    Type
    Preprint
    Authors
    Goli, V. M. L. D. P.
    Manchon, Aurelien cc
    KAUST Department
    Material Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    Spintronics Theory Group
    Date
    2020-05-27
    Permanent link to this record
    http://hdl.handle.net/10754/663639
    
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    Abstract
    We investigate the spin transport across the magnetic phase diagram of a frustrated antiferromagnetic insulator and uncover a drastic modification of the transport regime from spin diffusion to spin superfluidity. Adopting a triangular lattice accounting for both nearest neighbor and next-nearest neighbor exchange interactions with easy-plane anisotropy, we perform atomistic spin simulations on a two-terminal configuration across the full magnetic phase diagram. We found that as long as the ground state magnetic moments remain in-plane, irrespective of whether the magnetic configuration is ferromagnetic, collinear or non-collinear antiferromagnetic, the system exhibits spin superfluid behavior with a device output that is independent on the value of the exchange interactions. When the magnetic frustration is large enough to compete with the easy-plane anisotropy and cant the magnetic moments out of the plane, the spin transport progressively evolves towards the diffusive regime. The robustness of spin superfluidity close to magnetic phase boundaries is investigated and we uncover the possibility for {\em proximate} spin superfluidity close to the ferromagnetic transition.
    Publisher
    arXiv
    arXiv
    2005.13481
    Additional Links
    https://arxiv.org/pdf/2005.13481
    Collections
    Preprints; Physical Science and Engineering (PSE) Division; Spintronics Theory Group; Material Science and Engineering Program

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