Published in
American Physical Society, Physical Review Letters, 23(91)
DOI: 10.1103/physrevlett.91.237203
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Ferromagnetism in fcc Twinned 2.4 nm Size Pd Nanoparticles
,
R. Litrán,
J. C. Sánchez López ,
C. López Cartes,
A. Fernandez ,
J. Ramírez,
J. M. González Calbet,
M. Vallet
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Abstract
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.