Antiferromagnetic Resonance in CoF2, NiF2, and MnCO3

摘要

The far‐infrared transmission spectra of CoF2, NiF2, and MnCO3 have been measured from 3 to 100 cm-1 using the techniques of Fourier‐transform interferometry. Antiferromagnetic resonance branches have been found in CoF2 at 28.5 cm-1 and 36 cm-1 at temperature T≈0, each of which splits in a magnetic field along the c axis. These resonances have been studied as a function of field, temperature, and uniaxial stress. Antiferromagnetic resonance at 31.1 cm-1 and ferromagnetic resonance at 3.33 cm-1 in NiF2 at T≈0 have been studied as a function of field and temperature, and the results are compared with Moriya''s theory. Antiferromagnetic resonance has been observed at 4.13 cm-1 in MnCO3 at T≈0.