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A self-consistent tight-binding method has been used to calculate the average magnetic moments of Ni N clusters between Nϭ5 and 16. The geometrical structures were taken from the results of moleculardynamics simulations with semiempirical potentials. The agreement with experiment ͑minima of at Nϭ6 and 13, and a maximum for Nϭ8) is good, and the variations of the average magnetic moment are explained as a consequence of geometrical effects: low coordinated atoms have large magnetic moments. Furthermore, the deviation of the interatomic distances from a smooth behavior also influences the magnetic moments. The contribution of the sp electrons to the magnetism is found to be relevant for Ni clusters with less than ten atoms. ͓S0163-1829͑97͒06219-X͔

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