Spin Seebeck Effect from Antiferromagnetic Magnons and Critical Spin Fluctuations in Epitaxial FeF2 Films

We report a longitudinal spin Seebeck effect (SSE) study in epitaxially grown FeF2ð110Þ antiferromagnetic (AFM) thin films with strong uniaxial anisotropy over the temperature range of 3.8–250 K. Both the magnetic-field and temperature-dependent SSE signals below the N´eel temperature (TN ¼ 70 K) of the FeF2 films are consistent with a theoretical model based on the excitations of AFM magnons without any net induced static magnetic moment.

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