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Indication of intrinsic room-temperature ferromagnetism in thin film: An x-ray magnetic circular dichroism study
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View: Figures


Image of FIG. 1.
FIG. 1.

(Color online) Co -edge XAS and XMCD of rutile-type . (a) Photon helicity dependent XAS recorded at and . and stand for the absorption coefficients with parallel (↑↑) and antiparallel (↑↓) to the Co majority-spin direction. An energy integral, , gives , defined in the text. Arrows A–G denote multiplet features. (b) XMCD spectrum and its energy integral. Integrals and represent and , respectively, in the text.

Image of FIG. 2.
FIG. 2.

(Color online) Enlarged plots of spectra in the Co region of . (a) Co -edge XAS. (b) Co -edge XMCD. Note the multiplet features denoted by arrows in the XMCD spectrum, corresponding to features A–E in the XAS. This peculiar XMCD spectrum is in sharp contrast to the smooth and featureless XMCD spectrum of metallic Co, which is plotted for a comparison on a scale reduced by a factor of 0.06.

Image of FIG. 3.
FIG. 3.

(Color online) Comparison of the experimental spectra with atomic-multiplet calculations. (a) XAS. (b) XMCD spectra. Calculations were done for the low-spin ion and the high-spin ion in crystal fields with symmetry, and the high-spin ion in a crystal field with symmetry. The calculated XMCD spectra were scaled by a factor of for a comparison with the experimental XMCD spectrum.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Indication of intrinsic room-temperature ferromagnetism in Ti1−xCoxO2−δ thin film: An x-ray magnetic circular dichroism study