Anomalous magnetism in noble metal (nano)particles

In a previous article published in Langmuir 27 (2011) 7783–7787, we reported on a novel synthesis route to make magnetic noble metal nanoparticles and nanoparticle clusters. In this article we demonstrate an enhanced method of recovering the magnetic particles after synthesis and give an insight into the temperature dependence of their magnetization. Based on our findings, we conclude that the magnetism induced by our method has a dominant contribution from the surface instead of the bulk as is common for classical magnetism.