Ferromagnetism in fcc twinned 2.4 nm size Pd nanoparticles.
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.
Sampedro
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B
Instituto de Magnetismo Aplicado, "Salvador Velayos," UCM, RENFE, CSIC, Las Rozas, PO Box 155, Madrid 28230, Spain.
Crespo
P
P
Hernando
A
A
Litrán
R
R
Sánchez López
J C
JC
López Cartes
C
C
Fernandez
A
A
Ramírez
J
J
González Calbet
J
J
Vallet
M
M