Physics – Condensed Matter – Materials Science
Scientific paper
2005-02-15
Phys. Rev. B 71, 224103 (2005)
Physics
Condensed Matter
Materials Science
9 pages, 3 figures
Scientific paper
10.1103/PhysRevB.71.224103
The dependencies on strain and oxygen vacancies of the ferroelectric polarization and the weak ferromagnetic magnetization in the multiferroic material bismuth ferrite, BiFeO_3, are investigated using first principles density functional theory calculations. The electric polarization is found to be rather independent of strain, in striking contrast to most conventional perovskite ferroelectrics. It is also not significantly affected by oxygen vacancies, or by the combined presence of strain and oxygen vacancies. The magnetization is also unaffected by strain, however the incorporation of oxygen vacancies can alter the magnetization slightly, and also leads to the formation of Fe^{2+}. These results are discussed in light of recent experiments on epitaxial films of BiFeO_3 which reported a strong thickness dependence of both magnetization and polarization.
Ederer Claude
Spaldin Nicola A.
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