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