Bulk and Surface Magnetization of Co atoms in Rutile Ti_[1-x]Co_xO_[2-delta] Thin Films Revealed by X-Ray Magnetic Circular Dichroism

Abstract

We have studied magnetism in Ti_[1-x]Co_xO_[2-δ] thin films with various x and δby soft x-ray magnetic circular dichroism (XMCD) measurements at the Co L_[2,3] absorption edges. The estimated ferromagnetic moment by XMCD was 0.15-0.24 μβ/Co in the surface, while in the bulk it was 0.82-2.25 μβ/Co, which is in the same range as the saturation magnetization of 1.0-1.5 μβ/Co. Theseresults suggest that the intrinsic origin of the erromagnetism. The smaller moment of Co atom at surface is an indication of a magnetically dead layer of a few nm thick at the surface of the thin films.

This Paper is accepted in J. of Phys: Conds. Matter

References in corpus (7)

• 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
• Electronic structures of doped anatase $\mathrm{Ti}{\mathrm{O}}_2$: $\mathrm{T}{\mathrm{i}}_{1-\mathrm{x}}{\mathrm{M}}_{\mathrm{x}}{\mathrm{O}}_2$ (M=Co, Mn, Fe, Ni)
• Evolution of ferromagnetic circular dichroism coincident with magnetization and anomalous Hall effect in Co-doped rutile TiO2
• Indication of intrinsic room-temperature ferromagnetism in Ti1-xCoxO2-d thin film: An x-ray magnetic circular dichroism study
• 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

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• Electronic and magnetic properties of off-stoichiometric Co${}_2$Mn${}_{\beta }$Si/MgO interfaces studied by x-ray magnetic circular dichroism