Geometrical magnetic structures of transition-metal clusters

We calculate electronic states of the transition-metal clusters, Ni19, Ni55, Fe15, Fe35 Cr15, and Cr35 by using the local spin density functional method. We discuss geometrical magnetic structures of the ferromagnetic and antiferromagnetic clusters. For the fcc Ni and bcc Fe clusters, the minimum moment appears on the second layer from the surface of the clusters. The local moments are nearly equal to or larger than the value in the bulk crystal except for the second layer. For the bcc Cr clusters, the local moments strongly depend on the atomic site, and decrease with increasing the coordination number of the atomic site. The moment of the Cr clusters also strongly depends on the interatomic distance.