Oxygen<i>K</i>x-ray-absorption near-edge structure of alkaline-earth-metal and 3<i>d</i>-transition-metal oxides

Nakai, S.; Mitsuishi, Tsutomu; Sugawara, Hideo; Maezawa, H.; Matsukawa, T.; Mitani, Satoshi; Yamasaki, Kazuo; Fujikawa, Takashi

doi:10.1103/physrevb.36.9241

Cited by 85 publications

(51 citation statements)

References 18 publications

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“…[14,15]. Our XANES data for pure NiO are characterized by six main features, labelled from A to F, in good agreement with the data of Nakai et al [16] and Kuiper et al [17]. The other spectra are those of the Ni c Mg 1−c O solid solutions with the composition c = 0.99, 0.90, 0.80, 0.65, and 0.55.…”

Section: Methodssupporting

confidence: 90%

Structural disorder and electronic hybridization in Ni_cMg_1−cO solid solutions probed by XANES at the oxygen K edge

Chen¹,

Zhong²,

Chu³

et al. 2007

J. Phys.: Condens. Matter

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A series of Ni c Mg 1−c O solid solutions has been studied for the first time looking at the structural disorder by means of x-ray absorption near-edge-structure (XANES) spectroscopy at the oxygen K edge. The experimental XANES signals were analysed within the full multiple scattering formalism and were interpreted taking into account clusters of up to 15 coordination shells around an absorbing oxygen atom. The substitution of nickel atoms by magnesium atoms results in a dramatic decrease of the empty density of states in the conduction band close to the Fermi level due to an exchange of the 3d(Ni)-2p(O) interaction with 3p(Mg)-2p(O). Besides, a simultaneous small decrease of the 3d(Ni)-2p(O) hybridization is also induced by the lattice expansion, determined by the difference in ionic radii between nickel and magnesium ions.

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Section: Methodssupporting

confidence: 90%

Structural disorder and electronic hybridization in Ni_cMg_1−cO solid solutions probed by XANES at the oxygen K edge

Chen¹,

Zhong²,

Chu³

et al. 2007

J. Phys.: Condens. Matter

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“…Photoelectric-yield spectra [3] measured on powdered MgO show similar structure. Using bremsstrahlung radiation from a tungsten target, in conjunction with an X-ray spectrometer, they were able to measure the transmission of MgO films deposited onto 350nm-thick aluminum foil.…”

mentioning

confidence: 69%

Magnesium Oxide (MgO)

Roessler

1997

Handbook of Optical Constants of Solids

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“…Figure 6 shows the O K-edge XAS spectra ͑B =0 T͒ of the 1-and 10-ML samples. The strong peaks observed for h Ͼ 535 eV originate from oxygen in the MgO barrier 30 and AlO x capping layer. Interestingly, pre-edge structures were clearly observed for the 1-ML sample at 530 eVϽ h Ͻ 535 eV.…”

Section: Discussionmentioning

confidence: 99%

Magnetic states of Mn and Co atoms atCo2MnGe/MgOinterfaces seen via soft x-ray magnetic circular dichroism

et al. 2010

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The magnetic states of Mn and Co atoms in Co-rich Co 2 MnGe Heusler alloy thin films facing an MgO barrier were studied by means of soft x-ray magnetic circular dichroism ͑XMCD͒. In particular, the Co 2 MnGe film-thickness dependence of the Mn and Co magnetic moments was investigated. With a decrease in the Co 2 MnGe film thickness to 1-2 monolayers ͑MLs͒, the spin magnetic moment of Mn decreased and the Mn L 2,3 -edge x-ray absorption spectra ͑XAS͒ showed a Mn 2+ -like multiplet structure in MnO, in contrast to samples thicker than 4 ML, indicating that the Mn atoms of the 1 and 2 ML samples were oxidized. The Co spin magnetic moment increased slightly with decreasing thickness. A Co 2+ -like multiplet structure in CoO was not observed in all the Co L 2,3 -edge XAS and XMCD, indicating that, even in the ultrathin samples, the Co atoms were not oxidized, and were more strongly spin polarized than those in the thicker samples. Co spin magnetic moments of 1.40-1.77 B larger than the theoretical value for ideal stoichiometric Co 2 MnGe ͑ϳ1 B ͒ and the Co-rich film composition imply the presence of Co antisites that would lower the spin polarization.

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OxygenKx-ray-absorption near-edge structure of alkaline-earth-metal and 3d-transition-metal oxides

Cited by 85 publications

References 18 publications

Structural disorder and electronic hybridization in Ni_cMg_1−cO solid solutions probed by XANES at the oxygen K edge

Structural disorder and electronic hybridization in Ni_cMg_1−cO solid solutions probed by XANES at the oxygen K edge

Magnesium Oxide (MgO)

Magnetic states of Mn and Co atoms atCo2MnGe/MgOinterfaces seen via soft x-ray magnetic circular dichroism

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OxygenKx-ray-absorption near-edge structure of alkaline-earth-metal and 3d-transition-metal oxides

Cited by 85 publications

References 18 publications

Structural disorder and electronic hybridization in NicMg1−cO solid solutions probed by XANES at the oxygen K edge

Structural disorder and electronic hybridization in NicMg1−cO solid solutions probed by XANES at the oxygen K edge

Magnesium Oxide (MgO)

Magnetic states of Mn and Co atoms atCo2MnGe/MgOinterfaces seen via soft x-ray magnetic circular dichroism

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Structural disorder and electronic hybridization in Ni_cMg_1−cO solid solutions probed by XANES at the oxygen K edge

Structural disorder and electronic hybridization in Ni_cMg_1−cO solid solutions probed by XANES at the oxygen K edge