Abstract
The antiferromagnetic resonance (AFMR) linewidth of MnF2 has been studied near the Néel temperature TN. In the presence of an applied magnetic field, the linewidth diverges as | T−TN |−56. In the absence of an applied field, the linewidth is larger and diverges approximately as | T−TN |−43. The linewidth is independent of magnetic field direction and is the same for both branches of the AFMR spectrum. Near TN the AFMR frequency varies as |T−TN|0.483±0.025 whereas the simplest molecular field theory predicts a |T−TN|½ variation. From this temperature dependence, together with existing data on the fluorine nuclear magnetic resonance in MnF2, we find that the anisotropy energy EA is proportional to M2.89±0.16 compared to Zener's M3 and Oguchi's M2.9 theoretical results. Above TN, the electron paramagnetic resonance in MnF2 has been observed. For H0 ∥ c the linewidth varies as (T−TN)−3/8 near TN. For H0⊥c the linewidth increases more slowly as TN is approached.
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