Abstract
Using inelastic neutron scattering we have studied the magnetic excitations in HoNi2. Several modes have been observed in the [001] direction showing that the magnetic excitations in this compound are governed by crystal field effects. The acoustic mode is the only one which is weakly dispersive. The JHo-Ho interaction deduced is very weak and leads to a calculated Curie temperature much smaller than the experimental one. This shows that although the nickel is not magnetic it could contribute to the magnetic ordering. An analysis of the complete results in terms of crystalline electric field and Heisenberg type exchange interaction fails to account simultaneously for magnetization and inelastic neutron measurement.
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