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Spin transport of magnonic excitations in uniaxial insulatingantiferromagnets (AFs) is investigated. In linear response to spin biasing anda temperature gradient, the spin transport properties ofnormal-metal--insulating antiferromagnet--normal-metal heterostructures arecalculated. We focus on the thick-film regime, where the AF is thicker than themagnon equilibration length. This regime allows the use of a drift-diffusionapproach, which is opposed to the thin-film limit considered by Bender {\it etal.} 2017, where a stochastic approach is justified. We obtain the temperature-and thickness-dependence of the structural spin Seebeck coefficient$\mathcal{S}$ and magnon conductance $\mathcal{G}$. In their evaluation weincorporate effects from field- and temperature-dependent spin conservinginter-magnon scattering processes. Furthermore, the interfacial spin transportis studied by evaluating the contact magnon conductances in a microscopic modelthat accounts for the sub-lattice symmetry breaking at the interface. We findthat while inter-magnon scattering does slightly suppress the spin Seebeckeffect, transport is generally unaffected, with the relevant spin decay lengthbeing determined by non-magnon-conserving processes such as Gilbert damping. Inaddition, we find that while the structural spin conductance may be enhancednear the spin flip transition, it does not diverge due to spin impedance at thenormal metal|magnet interfaces.

Spin Transport in Thick Insulating Antiferromagnetic Films