Abstract
The magnetisation of the nearly two-dimensional weakly anisotropic ferromagnets (CnH2dn+1NH3)2CuCl4 has been studied by means of Cu and Cl nuclear magnetic resonance. The hyperfine interaction of Cu and Cl nuclei and the Cu2+ spin direction were determined. The field dependence of the magnetisation has been measured in the range 0 to 10 kOe. This allowed the intralayer exchange integral J to be determined using simple spin-wave theory taking into account experimental magnetic anisotropy and interlayer exchange. The temperature dependence of spontaneous magnetisation measured in the range 1.4 to 4.2K is well described by the theory using this J value.
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