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In the last few years an intensive research effort has been
devoted to synthesize diluted magnetic semiconductors
DMSs in the hope of finding a material with semiconducting
properties and ferromagnetism at room temperature RT.
Standard DMS are produced by doping conventional semiconductors
with transition metals,1 and the magnetic coupling
usually originates from some carrier-induced mechanism.
More recently two main experimental facts have
challenged this ¡°traditional¡± picture. First magnetism was
claimed in oxides DMS on both sides of the metal insulator
transition,2 indicating that carriers alone are not sufficient to
explain the magnetism and that intrinsic defects play a crucial
role.3 Second, defect-rich or intentionally p-doped oxides
revealed the possible evidence for RT magnetism. This
second class of phenomena has been named d0 magnetism,
indicating that no ions with partially filled d-shells are at the
origin of the magnetic moment. The examples of d0 magnets
are many and include thin films of HfO2,4 TiO2,5¨C7 In2O3,8
C-doped ZnO,9,10 and nanoparticles of different materials.11
Furthermore studies over chemically synthesized powders
suggest that d0 magnetism can be found in bulk materials and
not only in surfaces
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