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Effect of Magnetic Dipolar Interaction on Antiferromagnetic Resonance in (C 2 H 5 NH 3 ) 2 CuCl 4

Antiferromagnetic resonance experiments on (C 2 H 5 NH 3 ) 2 CuCl 4 with various-shaped samples have been performed in the frequency range of 0.8 to 8 GHz at T =1.4 K. The experimental results can be understood over the wide frequency range by the theory including the surface demagnetizing field, the Lorentz field and newly introduced magnetic dipolar anisotropy field which changes with canting angle between sublattice magnetizations. Following parameters are determined: antiferromagnetic interlayer exchange field H E '=829 Oe, orthorhombic anisotropy fields are 74 Oe and 1950 Oe in antiferromagnetic phase and 73 Oe and 1504 Oe in field-induced paramagnetic phase.