Ferromagnetism and structural defects in V-doped titanium dioxideстатья
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Дата последнего поиска статьи во внешних источниках: 26 июня 2014 г.
Аннотация:We report recent experimental results about influence of negatively
charged structural defects on room-temperature ferromagnetism
in V-doped TiO2-δ thin films with different electric
conductivities. Films were prepared on LaAlO3 (001) substrates
by RF magnetron sputtering in reduced argon-oxygen atmosphere,
while the V to Ti metal ratio was fixed at 1 at.%. The
ferromagnetic order at room temperature (RT) was confirmed
by SQUID magnetometry. Positron annihilation spectroscopy
(PAS) was applied to check the presence of open-volume defects
in the TiO2-δ matrix. The relation between ferromagnetic
properties and amount of negatively charged defects in the
studied films was established. The collection of structural,
magnetometry, magnetotransport, magneto-optic and PAS data
hints towards the defect-induced model of ferromagnetism in 1
at.% V-doped TiO2-δ thin films.