[en] We have studied the influence of the stoichiometry on the structural, magnetic, and magneto-optical properties of bismuth iron garnet (Bi3Fe5O12) thin films grown by pulsed laser deposition. Films with different stoichiometries have been obtained by varying the Bi/Fe ratio of the target and the oxygen pressure during deposition. Stoichiometry variations influence the Curie temperature T-C by tuning the (Fe)-O-[Fe] geometry: TC increases when the lattice parameter decreases, contrary to what happens in the case of stoichiometric rare-earth iron garnets. The thermal variation of the magnetization, the Faraday rotation, and the Faraday ellipticity have been analyzed in the frame of the Neel two-sublattice magnetization model giving energies of -48 K (4.1 meV), -29 K (2.5 meV), and 84 K (7.3 meV) for the three magnetic exchange integrals j(aa), j(dd), and j(ad), respectively. Magneto-optical spectroscopy linked to compositional analysis by Rutherford backscattering spectroscopy shows that Bi and/or Fe deficiencies also affect the spectral variation (between 1.77 and 3.1 eV). Our results suggest that bismuth deficiency has an effect on the magneto-optical response of the tetrahedral Fe sublattice, whereas small iron deficiencies affect predominantly the magneto-optical response of the octahedral sublattice.
Disciplines :
Physics
Author, co-author :
Vertruyen, Bénédicte ; Université de Liège - ULiège > Département de chimie (sciences) > Chimie inorganique structurale
Cloots, Rudi ; Université de Liège - ULiège > Département de chimie (sciences) > Chimie inorganique structurale
Abell, J. S.; The University of Birmingham > School of Engineering
Jackson, T. J.; The University of Birmingham > School of Engineering
da Silva, R. C.; Instituto Tecnologico e Nuclear, Sacavém, Portugal > Laboratório de Feixes de Iões
Popova, E.; Université de Versailles - Saint-Quentin > Groupe d’Etude de la Matière Condensée
Keller, N.; Université de Versailles - Saint-Quentin > Groupe d’Etude de la Matière Condensée
Language :
English
Title :
Curie temperature, exchange integrals, and magneto-optical properties in off-stoichiometric bismuth iron garnet epitaxial films
Publication date :
2008
Journal title :
Physical Review. B, Condensed Matter and Materials Physics
ISSN :
1098-0121
eISSN :
1550-235X
Publisher :
Amer Physical Soc, College Pk, United States - Maryland
Volume :
78
Issue :
9
Pages :
094429
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE] CGRI - Commissariat général aux Relations internationales [BE] RMA - Royal Military Academy [BE] CNRS - Centre National de la Recherche Scientifique [FR]
Commentary :
Copyright American Physical Society. The following article appeared in Physical Review B and may be found at http://link.aps.org/doi/10.1103/PhysRevB.78.094429
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