Orbital Reconstruction and Interface Ferromagnetism in Self-Assembled Nanosheet Superlattices

We have investigated the interface electronic states in self-assembled (Ti0.8Co0.2O2/Ti0.6Fe0.4O2) n superlattices by X-ray photoelectron spectroscopy. A charge of about −0.3 electron is transferred from Fe to Co ions across the interface and induces a major reconstruction of the orbital occupation...

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Bibliographic Details
Published in:ACS nano 2011-09, Vol.5 (9), p.6871-6879
Main Authors: Osada, Minoru, Sasaki, Takayoshi, Ono, Kanta, Kotani, Yoshinori, Ueda, Shigenori, Kobayashi, Keisuke
Format: Article
Language:English
Subjects:
Charge transfer
Cobalt
Iron
Nanostructure
Occupation
Orbitals
Oxides
Reconstruction
Superlattices
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Summary:We have investigated the interface electronic states in self-assembled (Ti0.8Co0.2O2/Ti0.6Fe0.4O2) n superlattices by X-ray photoelectron spectroscopy. A charge of about −0.3 electron is transferred from Fe to Co ions across the interface and induces a major reconstruction of the orbital occupation at the interfacial (Ti0.8Co0.2O2/Ti0.6Fe0.4O2) layers. Supported by first-principles calculations, the Co3+ state is partially occupied at the interface by superlattice formation, and this new magnetic state directly influences the coupling between Ti0.8Co0.2O2 and Ti0.6Fe0.4O2 nanosheets. These data indicate that the orbital reconstruction is indeed realized by the interface charge transfer between Co and Fe ions in the adjoined nanosheets, and the generic feature of engineered interfaces can be extended to self-assembled superlattices of oxide nanosheets.
ISSN:1936-0851
1936-086X
DOI:10.1021/nn200835v