Signature of Carrier-Induced Ferromagnetism in Ti_{1-x}Co_{x}O_{2-delta}: Exchange Interaction Between High-Spin Co 2+ and the Ti 3d Conduction Band

Abstract

X-ray photoemission spectroscopy measurements were performed on thin-film samples of rutile Ti_{1-x}Co_{x}O_{2-delta} to reveal the electronic structure. The Co 2p core level spectra indicate that the Co ions take the high-spin Co 2+ configuration, consistent with substitution on the Ti site. The high spin state and the shift due to the exchange splitting of the conduction band suggest strong hybridization between carriers in the Ti 3d t2g band and the t2g states of the high-spin Co 2+. These observations support the argument that room temperature ferromagnetism in Ti_{1-x}Co_{x}O_{2-delta} is intrinsic.

4 pages, 5 figures. Accepted for publication in Physical Review Letters

References in corpus (1)

• Electronic Structure and Optical Properties of the Co-doped Anatase TiO${}_2$ Studied from First Principles

Cited by in corpus (8)

• Oxide spintronics
• Experimental studies on vacancy induced ferromagnetism in undoped TiO2
• Theory of carrier mediated ferromagnetism in dilute magnetic oxides
• Electronic and magnetic properties of V-doped anatase TiO${}_2$ from first principles
• Role of charge carriers for ferromagnetism in cobalt-doped rutile TiO2
• X-ray Anomalous Scattering of Diluted Magnetic Oxide Semiconductors: Possible Evidence of Lattice Deformation for High Temperature Ferromagnetism
• Effects of the crystal structure on the ferromagnetic correlations in ZnO with magnetic impurities
• Hybridization between the conduction band and 3d orbitals in the oxide-based diluted magnetic semiconductor In${}_{2-x}$V${}_x$O${}_3$