Ferromagnetism of free clusters

Metastability of Free Cobalt and Iron Clusters: A Possible Precursor to Bulk Ferromagnetism.
Xiaoshan Xu, Shuangye Yin, Ramiro Moro, Anthony Liang, John Bowlan, and Walt A. de Heer
Phys. Rev. Lett. 107, 057203 (2011)

P(M) for Co and Fe clusters for various thermalization conditions. Amplitudes are represented in color (blue:
low; red: high).