Abstract
The magnetization of Pd and Au nano-particles with a diameter of around 3 nm was measured down to 4.2 K. The data of magnetization of both nano-particles show an unexpectedly large magnetic moment of about 20 spins per particle. This result can not be understood by so-called odd/even electron number effect and Stoner's enhancement model. The result might suggest the existence of some common and characteristic spin correlation mechanism in the nano-particles. The experimental result of size dependence on Pd nano-particles shows existence of a critical size of about 3 nm from a atomic spin correlation region to a metallic spin correlation region.
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