Algebraic decay of non-local spin transport in NiO

Long-distance and low-dissipation spin transport is a crucial goal for spintronics where flow of spin angular momentum is considered as an information carrier. It has been theoretically predicted that when magnetization dynamics is confined in a two dimensional space and undergoes a rotational symmetry, spin angular momenta can be transported in a low dissipative mode, which is the so-called spin superfluidity. In this study, we investigated the spin transport in a magnetic easy-plane of an antiferromagnetic NiO thin film where magnetization dynamics is confined while satisfying the requirements for spin superfluidity.