Superexchange and iron valence control by off-stoichiometry in yttrium iron garnet thin films grown by pulsed laser deposition

Controlled off-stoichiometric single phase polycrystalline yttrium iron garnet (YIG) thin films have been grown by pulsed laser deposition, adjusting the oxygen partial pressure P O 2 between 5 and 400 mTorr. Atomic stoichiometry by RBS shows an oxygen deficiency for P O 2 < P stoich and iron and...

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Bibliographic Details
Published in:Journal of applied physics 2005-05, Vol.97 (10), p.10G108-10G108-3
Main Authors: Dumont, Y., Keller, N., Popova, E., Schmool, D. S., Bhattacharya, S., Stahl, B., Tessier, M., Guyot, M.
Format: Article
Language:English
Subjects:
CURIE POINT
ENERGY BEAM DEPOSITION
FERRITE GARNETS
LASER RADIATION
LATTICE PARAMETERS
MAGNETIZATION
MATERIALS SCIENCE
OXYGEN
PARTIAL PRESSURE
PHASE DIAGRAMS
POLYCRYSTALS
PULSED IRRADIATION
RUTHERFORD BACKSCATTERING SPECTROSCOPY
STOICHIOMETRY
THIN FILMS
VACANCIES
YTTRIUM COMPOUNDS
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Summary:Controlled off-stoichiometric single phase polycrystalline yttrium iron garnet (YIG) thin films have been grown by pulsed laser deposition, adjusting the oxygen partial pressure P O 2 between 5 and 400 mTorr. Atomic stoichiometry by RBS shows an oxygen deficiency for P O 2 < P stoich and iron and yttrium deficiency for P O 2 > P stoich . P stoich = 30 mTorr refers to films showing magnetic and structural properties of the bulk stoichiometric YIG. Curie temperature T c and saturation magnetization 4 π Ms decreased for P O 2 < P stoich , whereas a new part of the YIG phase diagram is explored for P O 2 > P stoich : Increase of Tc (up to + 10 % ) and of 4 π Ms (up to + 20 % ) and lattice parameter compression. Microscopic interpretation is given in terms of superexchange interaction and creation and site selectivity of iron vacancies.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.1860991