%0 Journal Article %A Sampedro, B. %A Crespo del Arco, Patricia %A Hernando Grande, Antonio %A Litran, R. %A Sánchez López, J. C. %A López Cartes, C. %A Fernández, A. %A Ramírez, J. %A González Calbet, José María %A Vallet, M. %T Ferromagnetism in fcc twinned 2.4 nm size Pd nanoparticles %D 2003 %@ 0031-9007 %U https://hdl.handle.net/20.500.14352/52028 %X The onset of ferromagnetism has been experimentally observed in small Pd particles of average diameter 2.4 nm. High-resolution studies reveal that a high percentage of the fcc particle exhibits single and multiple twinning boundaries. The spontaneous magnetization close to 0.02 emu/g seems to indicate that only a small fraction of atoms holds a permanent magnetic moment and contributes to ferromagnetism. The possible origin of ferromagnetism is briefly discussed according to different models recently reported. %~