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We report a longitudinal spin Seebeck effect (SSE) study in epitaxially grownFeF2(110) antiferromagnetic (AFM) thin films with strong uniaxial anisotropyover the temperature range of 3.8 - 250 K. Both the magnetic field- andtemperature-dependent SSE signals below the N\'eel temperature (TN=70 K) of theFeF2 films are consistent with a theoretical model based on the excitations ofAFM magnons without any net induced static magnetic moment. In addition to thecharacteristic low-temperature SSE peak associated with the AFM magnons, thereis another SSE peak at TN which extends well into the paramagnetic phase. Allthe SSE data taken at different magnetic fields up to 12 T near and above thecritical point TN follow the critical scaling law very well with the criticalexponents for magnetic susceptibility of 3D Ising systems, which suggests thatthe AFM spin correlation is responsible for the observed SSE near TN.

Spin Seebeck effect from antiferromagnetic magnons and critical spin fluctuations in epitaxial FeF2 films