Indication of intrinsic room-temperature ferromagnetism in Ti1-xCoxO2-d thin film: An x-ray magnetic circular dichroism study

Abstract

Soft x-ray magnetic circular dichroism (XMCD) measurements at the Co L2,3 edges of Co doped rutile TiO2 at room temperature have revealed clear multiplet features characteristic of ferromagnetic Co2+ ions coordinated by O2- ions, being in sharp contrast to the featureless XMCD spectrum of Co metal or metallic clusters. The absorption and XMCD spectra agree well with a full atomic-multiplet calculation for the Co2+ high-spin state in the D2h-symmetry crystal field at the Ti site in rutile TiO2. The results indicate that the ferromagnetism arises from the Co2+ ions substituting the Ti4+ ions.

arXiv comment11 pages including 3 figures

References in corpus (5)

• High Temperature Ferromagnetism with Giant Magnetic Moment in Transparent Co-doped SnO2-d
• Co-occurrence of Superparamagnetism and Anomalous Hall Effect in Highly Reduced Cobalt Doped Rutile TiO2 Films
• Ferromagnetism in laser deposited anatase Ti${}_{1-x}$Co${}_x$O$_{2-$δ$}$ films
• Characterization of Magnetic Components in the Diluted Magnetic Semiconductor Zn${}_{1-x}$Co${}_x$O by X-ray Magnetic Circular Dichroism
• Evolution of ferromagnetic circular dichroism coincident with magnetization and anomalous Hall effect in Co-doped rutile TiO2

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