Superexchange and iron valence control by off-stoichiometry in yttrium iron garnet thin films grown by pulsed laser deposition
- LPSC, CNRS-University of Versailles, 1 Pl. A. Briand, 92192 Meudon, Cedex (France) and LMOV, CNRS-University of Versailles, 45 av. des Etats-Unis, 78035 Versailles, Cedex (France)
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{sub O2} between 5 and 400 mTorr. Atomic stoichiometry by RBS shows an oxygen deficiency for P{sub O2}<P{sub stoich} and iron and yttrium deficiency for P{sub O2}>P{sub stoich}. P{sub stoich}=30 mTorr refers to films showing magnetic and structural properties of the bulk stoichiometric YIG. Curie temperature T{sub c} and saturation magnetization 4{pi}Ms decreased for P{sub O2}<P{sub stoich}, whereas a new part of the YIG phase diagram is explored for P{sub O2}>P{sub stoich}: Increase of Tc (up to +10%) and of 4{pi}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.
- OSTI ID:
- 20711629
- Journal Information:
- Journal of Applied Physics, Vol. 97, Issue 10; Conference: 49. annual conference on magnetism and magnetic materials, Jacksonville, FL (United States), 7-11 Nov 2004; Other Information: DOI: 10.1063/1.1860991; (c) 2005 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
Similar Records
Effects of off-stoichiometry and density on the magnetic and magneto-optical properties of yttrium iron garnet films by magnetron sputtering method
Optical spectroscopy of sputtered nanometer-thick yttrium iron garnet films