Journal
SOLID STATE SCIENCES
Volume 7, Issue 6, Pages 660-667Publisher
ELSEVIER
DOI: 10.1016/j.solidstatesciences.2004.11.012
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Results on four ferromagnetic systems which contradict the accepted paradigms of localized or band magnetism are reviewed. The systems-irradiated graphite, nonstoichiometric CaB6, thin films of HfO2, and doped nonmagnetic oxides-all have small ferromagnetic moments and Curie points well above room temperature despite the absence of atoms with partially filled d or f shells. Parasitic ferromagnetic impurity phases are not a general explanation. A common feature is the presence of lattice or bond defects, which can give rise to-an impurity band. Some of the ways in which this impurity band may become spin-polarized are discussed. (c) 2005 Elsevier SAS. All rights reserved.
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