Investigation of optical and magneto-optical constants and their surface-oxide-layer effects of single-crystalline GdCo2

Lee, S.J.; Kim, K.J.; Canfield, Paul C.; Lynch, David W.

doi:10.1016/s0304-8853(00)00010-x

Cited by 5 publications

(7 citation statements)

References 22 publications

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“…The experimental spectrum is quite smooth, while calculations show a broad peak at ∼2.7 eV with the LSDA and LSDA +U approximations. The magnitude of the calculated optical conductivity is almost double that obtained from experiment [6,7]. Rhee's calculations also show a similar structure.…”

Section: Resultssupporting

confidence: 69%

“…This large magnitude could be attributed only partly to slight deviations from the sum rule for conductivity (i.e. values [6,7], which originally are much lower as compared to calculated values. The measured values, when corrected by Lee et al [7] for surface oxidation, show a remarkable enhancement, bringing the calculated magnitudes of σ 1xx in very good agreement with experiment.…”

Section: Resultsmentioning

confidence: 80%

“…We report a theoretical study of the optical and MO properties of GdFe 2 and GdCo 2 , studying the role of Fe/Co on these properties. We compare our results primarily with the recent data from [6,7], which is for single crystals.…”

Section: Introductionmentioning

confidence: 91%

“…They also presented a calculation of the optical and MO properties of RFe 2 compounds using the tight-binding linear muffin-tin orbital (TB-LMTO) method under the LSDA, treating the 4f electrons of the rare earth as valence electrons [6]. Lee et al [7] measured the optical and magneto-optical constants of single-crystalline GdCo 2 by spectroscopic ellipsometry. They also studied the effect of oxidation of the sample surface on the optical data, as GdCo 2 is known to be quite reactive with oxygen [8,9].…”

Section: Introductionmentioning

confidence: 99%

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Comparative study of optical and magneto-optical properties of GdFe₂and GdCo₂

Saini

Singh

Nautiyal

et al. 2007

J. Phys.: Condens. Matter

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We report calculations of the optical and magneto-optical properties of GdFe(2) and GdCo(2) using the full-potential linear-augmented-plane-wave method. Calculations with the Coulomb corrected local spin density approximation (LSDA+U) give a better representation of the band structure, density of states and magnetic moments compared to LSDA alone. However, both LSDA and LSDA+U approximations give fairly good agreement with experiment for the diagonal optical conductivity. The calculated results for GdCo(2) are in better agreement with the 'oxide corrected' data. Our results suggest that the data for GdFe(2) are most likely influenced by surface oxidation, due to the high reactivity of these compounds. For the much smaller off-diagonal components and Kerr rotation, LSDA results are better than the LSDA+U results, particularly in the energy range 0-3 eV. We show that the unphysical negative ellipticity values are taken care of by the use of stronger relaxation, which also improves the qualitative agreement with experimental data. Overall we have obtained a fair agreement with the experimental data for both optical and magneto-optical properties. We feel that measurements over a larger energy range are required for facilitating an exhaustive and decisive comparison and also to strengthen the bond between theory and experiments.

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Section: Resultssupporting

confidence: 69%

Section: Resultsmentioning

confidence: 80%

Section: Introductionmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Comparative study of optical and magneto-optical properties of GdFe₂and GdCo₂

Saini

Singh

Nautiyal

et al. 2007

J. Phys.: Condens. Matter

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show abstract

“…However, Di and Uchiyama corrected their measured spectrum for the effect of the SiO 2 overlayer used to protect his film, an effect that increases the magnitude of the true spectrum above that of the spectrum measured with the overlayer. We have previously modeled such an effect for GdCo 2 [30], finding that a correction for 200 ( A of a transparent overlayer increases the amplitude of Y K by a factor of about 1.5 at a peak, and by an even larger factor if the overlayer is absorbing. If such a correction applies to our MnBi data after correcting for the magnetization difference just described, the amplitude of our spectrum becomes larger than that of Di and Uchiyama.…”

Section: Magneto-optic Kerr Spectramentioning

confidence: 99%