X- ray photoemission study of the interaction of oxygen and air with clean cobalt surfaces

Brundle, C. R.; Chuang, T. J.; Rice, Dale W.

doi:10.1016/0039-6028(76)90318-6

Cited by 174 publications

(116 citation statements)

References 27 publications

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“…Changes that occur in the cobalt 2p region are considerably more subtile and are most obvious in the region of x = 0.6-0.7 (Figure 8), where there is a decrease in the 2p satellite structure and an appearance of a lower binding energy species, found as a shoulder at 779.6 eV for the 2p 3/2 transition. The changes are similar to those reported for Co 3 O 4 epitaxies formed upon oxidation of CoO(100) single crystal surfaces [13] and are comparable to the Co 2p XP spectra of Co 3 O 4 powdered samples [25,26].…”

Section: Resultssupporting

confidence: 85%

“…The intensity of the satellite structure decreases and an additional lower binding energy peak appears as the anomalous surface composition forms, as is observed for Co 3 O 4 and Co 3 O 4 -like epitaxies. The lower binding energy peak, observed as a shoulder at 2p 3/2 = 779.6 eV, is attributed to tetrahedrally coordinated Co 2+ in the pure Co 3 O 4 samples [13,26,30,31]. The octahedrally coordinated cobalt cations of CoO [13,[29][30][31] and Co 3 O 4 [13,[29][30][31] have comparable binding energies generally reported to be within ± 0.2 eV of each other at approximately 2p 3/2 = 780.5 eV despite the difference in their oxidation states.…”

Section: Discussionmentioning

confidence: 96%

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Surface composition of CoxNi1−xO solid solutions by X-ray photoelectron and Auger spectroscopies

Nydegger

Couderc

Langell

1999

Applied Surface Science

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Section: Resultssupporting

confidence: 85%

Section: Discussionmentioning

confidence: 96%

Surface composition of CoxNi1−xO solid solutions by X-ray photoelectron and Auger spectroscopies

Nydegger

Couderc

Langell

1999

Applied Surface Science

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“…The spectrum is similar to CoO O 1s photoemission data reported elsewhere. 2,10,[17][18][19][20] Unlike the rocksalt oxide, the cobalt-containing spinel materials, Co 3 Fig. 2 and while a welldeveloped Fuchs-Kliewer phonon spectrum is clearly evident, the characteristic hydroxyl stretching region ͑ϳ0.40 eV͒ remains featureless.…”

Section: Resultsmentioning

confidence: 99%

Nature of oxygen at rocksalt and spinel oxide surfaces

Langell

Kim

Pugmire

et al. 2001

Journal of Vacuum Science &Amp; Technology A: Vacuum, Surfaces, and Films

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The chemical environment of oxygen in cobalt-containing metal oxides with compositions͑M,MЈϭMn,Ni,Co͒ has been studied by Auger, x-ray and ultraviolet photoelectron, and high resolution electron energy loss spectroscopies. While there is a single type of lattice oxygen in the bulk structure of simple rocksalt and spinel oxides, the nature of oxygen at the surface of the spinel oxides is considerably more complex. Photoemission from core oxygen states in these materials often shows multiple peaks and satellite structure which have been attributed to a range of intrinsic and extrinsic oxygen states. All of these 3d transition metal oxides show a single, intense O 1s core photoemission peak at approximately 529.6 eV. In the spinel materials, a second state at 531.2 eV is also observed and is shown to be intrinsic to the spinel surface and not a result of hydroxylation or other surface contaminant. Similar photoemission features in Fe 3 O 4 were previously attributed to final state effects; however, the nature of the multiple final states remains to be elucidated.

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“…The Co 2p spectra shown in figure 2(b) presents prominent peaks at 779.7 and 795.0 eV related to the Co 2p 3/2 and 2p 1/2 spin-orbit components, respectively. Remarkable however is the lack of satellite features which in various compounds is a clear signature of Co 2+ in octahedral sites, most probably at high-spin configuration 28 .…”

Section: B X-ray Photoelectron Spectroscopymentioning

confidence: 99%

Training-induced inversion of spontaneous exchange bias field on La1.5Ca0.5CoMnO6

Bufaiçal

Finkler

Coutrim

et al. 2017

Journal of Magnetism and Magnetic Materials

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In this work we report the synthesis and structural, electronic and magnetic properties of La1.5Ca0.5CoMnO6 double-perovskite. This is a re-entrant spin cluster material which exhibits a non-negligible negative exchange bias effect when it is cooled in zero magnetic field from an unmagnetized state down to low temperature. X-ray powder diffraction, X-ray photoelectron spectroscopy and magnetometry results indicate mixed valence state at Co site, leading to competing magnetic phases and uncompensated spins at the magnetic interfaces. We compare the results for this Cadoped material with those reported for the resemblant compound La1.5Sr0.5CoMnO6, and discuss the much smaller spontaneous exchange bias effect observed for the former in terms of its structural and magnetic particularities. For La1.5Ca0.5CoMnO6, when successive magnetization loops are carried, the spontaneous exchange bias field inverts its sign from negative to positive from the first to the second measurement. We discuss this behavior based on the disorder at the magnetic interfaces, related to the presence of a glassy phase. This compound also exhibits a large conventional exchange bias, for which there is no sign inversion of the exchange bias field for consecutive cycles.

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X- ray photoemission study of the interaction of oxygen and air with clean cobalt surfaces

Cited by 174 publications

References 27 publications

Surface composition of CoxNi1−xO solid solutions by X-ray photoelectron and Auger spectroscopies

Surface composition of CoxNi1−xO solid solutions by X-ray photoelectron and Auger spectroscopies

Nature of oxygen at rocksalt and spinel oxide surfaces

Training-induced inversion of spontaneous exchange bias field on La1.5Ca0.5CoMnO6

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