TY - JOUR
T1 - Orbital reconstruction and interface ferromagnetism in self-assembled nanosheet superlattices
AU - Osada, Minoru
AU - Sasaki, Takayoshi
AU - Ono, Kanta
AU - Kotani, Yoshinori
AU - Ueda, Shigenori
AU - Kobayashi, Keisuke
PY - 2011/9/27
Y1 - 2011/9/27
N2 - We have investigated the interface electronic states in self-assembled (Ti0.8Co0.2O2/Ti0.6Fe 0.4O2)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 (Ti0.8Co0.2O 2/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.
AB - We have investigated the interface electronic states in self-assembled (Ti0.8Co0.2O2/Ti0.6Fe 0.4O2)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 (Ti0.8Co0.2O 2/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.
KW - ferromagnetic nanosheets
KW - interface ferromagnetism
KW - layer-by-layer assembly
KW - orbital reconstruction
KW - X-ray photoemission spectroscopy
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U2 - 10.1021/nn200835v
DO - 10.1021/nn200835v
M3 - Article
C2 - 21823647
AN - SCOPUS:80053326031
SN - 1936-0851
VL - 5
SP - 6871
EP - 6879
JO - ACS Nano
JF - ACS Nano
IS - 9
ER -