论文标题
散装易于平面抗fiferromagnet nio中的非本地自旋seebeck效应
Non-local spin Seebeck effect in the bulk easy-plane antiferromagnet NiO
论文作者
论文摘要
我们报告了通过易于平面抗fiferromagnet Nio的散装单晶中自旋seebeck效应（SSE）产生的镁自旋电流的观察。磁场会引起非分类性，从而导致具有相反自旋的木元模式的数量不平衡。然后，温度梯度会产生非零镁自旋电流。该SSE以5 $ \，$ K的散装Nio的本地和非本地几何形状进行测量。获得的信号的磁场依赖性是通过低能镁模式的磁场拆分来建模的，从而影响自旋塞贝克系数。在此温度下的相关木剂模式与立方各向异性和磁偶极偶极相互作用有关。非本地信号通过在注射器中的75 $ \，μA$中饱和，偏离了预期的二次焦耳加热。镁化学势不会随距离呈指数衰减，不均匀性可能是局部木元积累的结果。
We report the observation of magnon spin currents generated by the Spin Seebeck effect (SSE) in a bulk single crystal of the easy-plane antiferromagnet NiO. A magnetic field induces a non-degeneracy and thereby an imbalance in the population of magnon modes with opposite spin. A temperature gradient then gives rise to a non-zero magnon spin current. This SSE is measured both in a local and a non-local geometry at 5$\,$K in bulk NiO. The magnetic field dependence of the obtained signal is modelled by magnetic field splitting of the low energy magnon modes, affecting the spin Seebeck coefficient. The relevant magnon modes at this temperature are linked to cubic anisotropy and magnetic dipole-dipole interactions. The non-local signal deviates from the expected quadratic Joule heating by saturating at a current from around 75$\,μA$ in the injector. The magnon chemical potential does not decay exponentially with distance and inhomogeneities may be the result of local magnon accumulations.
