Antiferromagnetic resonance in NiCl 2 6H 2 O was investigated experimentally in the frequency range from 24 to 90 Gc/sec at liquid helium temperature using pulsed magnetic fields. The critical field H c was determined to be 40±1 kOe. The orthorhombic anisotropy fields H A 1 , H A 2 and the exchange field H E were found to be H A 1 =9.5±0.5, H A 2 =12.5±0.5 kOe, and H E =86±1 kOe by extending the theory of antiferromagnetic resonance to the strong anisotropy case. The anisotropy comes mainly from the crystalline field constants D and E which were estimated at -1.2cm -1 and 0.15 cm -1 , respectively. It was found that the spin easy axis is in the ac-plane and differs by an angle 7° from the a-axis. A very broad paramagnetic resonance was observed at 80°K. The origin of this broad line was attributed to the exchange mixing of several paramagnetic resonance lines.
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Date et al. (1967) studied this question.
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