Oxygen adsorption on Fe/W(110) and Co/W(110) thin films: Surface magnetic properties

Förster, Stefan; Baum, G.; Müller, Marius; Steidl, Hans

doi:10.1103/physrevb.66.134427

Cited by 29 publications

(22 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…2 are also displayed. Our UPS spectra for CoO agree well with those for CoO(100), 8 CoO films on Au(111) 9 and CoO films on Au(001). 11 The energy positions of the UPS structures seen for CoO agree well with those seen for NiO, and are very close to A-E.…”

Section: Oxygen Interaction With Co Filmssupporting

confidence: 84%

Interaction of O₂, CO and CO₂ with Co films

Frerichs

Schweiger

Voigts

et al. 2005

Surface & Interface Analysis

View full text Add to dashboard Cite

Metastable impact electron spectroscopy (MIES), ultraviolet photoelectron spectroscopy (UPS(HeI)) and x-ray photoelectron spectroscopy (XPS) were applied to study the interaction of O 2 , CO and CO 2 with Co films at room temperature. The films were produced on Si(100) surfaces under the in situ control of MIES, UPS and scanning tunnelling microscopy (STM). For O 2 , dissociative adsorption takes place initially and then incorporation of oxygen starts at exposures of ∼5 L. Comparison of the MIES and UPS spectra with those published for CoO shows that near-stoichiometric CoO films can be obtained by co-deposition of Co and O 2 . The CO is adsorbed molecularly up to a maximum coverage of ∼0.6 monolayer, with the C-end pointing towards the surface. The CO 2 adsorption is dissociative, resulting in the formation of Co-CO bonds at the surface. The resulting oxygen atoms are mostly incorporated into the Co layer. For all studied molecules the interaction with Co is similar to that with Ni.

show abstract

Section: Oxygen Interaction With Co Filmssupporting

confidence: 84%

Interaction of O₂, CO and CO₂ with Co films

Frerichs

Schweiger

Voigts

et al. 2005

Surface & Interface Analysis

View full text Add to dashboard Cite

show abstract

“…A positive asymmetry indicates that minority electrons dominate in the surface vacuum region of the clusters, agreeing with SPMDS studies of thin Fe films [8]- [10]. High positive asymmetries have been reported before for thin Fe films on various substrates including GaAs (15 %) [8], MgO(100) (9 %) [9], Ag(100) (6 %) [9], and W(110) (24 %) [7]. However, these values are not directly comparable to the asymmetry reported here for a number of reasons.…”

Section: Resultssupporting

confidence: 68%

“…3 (a) at ~14 eV is due to both electrons involved in the AN transition originating from the Fermi level, E F . The shoulder just below E F (corresponding to binding energies of a few eV) is due to emission from surface states of the Si(111) 7x7 reconstruction [4] and also Fe 3d electrons [7]. The shoulder at ~10.5 eV arises from emission of Si atomic 3p states found at the surface and in the bulk, and at low kinetic energies emission is dominated by true secondary electrons.…”

Section: Resultsmentioning

confidence: 99%

“…For Fe growth on W(110) [7] it was previously found that the crystallographic quality and cleanliness of the Fe film formed drastically affected the maximum asymmetry obtained. By the nature of their formation and deposition, the surface of the Fe nanoclusters is inherently clean and this could also contribute to the apparent enhancement in asymmetry.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Surface Spin Polarization of Fe Nanoclusters

et al. 2010

View full text Add to dashboard Cite

The spin polarization at the surface of Fe nanoclusters has been probed using a spin-polarized metastable helium beam. The clusters, produced in a gas aggregation source, display a lognormal size distribution with a peak centered at ~11 nm. Varying coverages of both spheroid-and cuboid-shaped particles were concomitantly deposited onto clean Si(111) substrates for investigation with the extremely surface sensitive technique of metastable de-excitation spectroscopy (MDS). A nominal cluster coverage of 8 Å yielded a maximum asymmetry of ~10 % in the ejected electron yield for He spins aligned parallel and anti-parallel to the magnetization direction of the clusters. When compared to values obtained from epitaxial Fe films on various substrates, the measured asymmetry suggests an enhancement in the surface spin polarization, as theoretically proposed. The atomic structure of the clusters and their topography on the Si(111) substrates were studied with transmission and scanning electron microscopy.

show abstract

“…The surface spin polarization shows characteristic behaviors at low oxygen exposures, 4-8 but it decreases with exposure Ͼ10 L ͑Refs. 5-8͒ and almost disappears at Ͼ50 L. 7,8 This however looks somewhat strange considering the fact that there are stable ferromagnetic Fe oxides ͑Fe 3 O 4 , ␥-Fe 2 O 3 ͒. Actually, a number of studies have indicated the formation of Fe 3 O 4 by room temperature oxidation for O 2 exposures Ͼ10 L. 9,10 In the present letter, we report a high negative spin polarization observed for the topmost surface of an Fe͑001͒/ MgO͑100͒ film oxidized at room temperature.…”

mentioning

confidence: 96%

Observation of a high negative spin polarization at the Fe/MgO(100) surface oxidized at room temperature

Kurahashi

Sun

Entani

et al. 2008

Applied Physics Letters

View full text Add to dashboard Cite

Spin polarization of an Fe/MgO(100) surface oxidized at room temperature has been analyzed with a spin-polarized metastable helium beam, which is an extremely surface sensitive spin probe, under high magnetic fields (0–50 kOe). The spin polarization of the Fe surface, although it initially decays with oxygen exposure, increases at >20 L (1 L=10−6 Torr sec) and becomes comparable to that observed for a clean Fe surface at >100 L. The polarization is negative and especially high at around the Fermi level. This may be understood if we assume the formation of Fe3O4.

show abstract

Oxygen adsorption on Fe/W(110) and Co/W(110) thin films: Surface magnetic properties

Cited by 29 publications

References 33 publications

Interaction of O₂, CO and CO₂ with Co films

Interaction of O₂, CO and CO₂ with Co films

Surface Spin Polarization of Fe Nanoclusters

Observation of a high negative spin polarization at the Fe/MgO(100) surface oxidized at room temperature

Contact Info

Product

Resources

About

Oxygen adsorption on Fe/W(110) and Co/W(110) thin films: Surface magnetic properties

Cited by 29 publications

References 33 publications

Interaction of O2, CO and CO2 with Co films

Interaction of O2, CO and CO2 with Co films

Surface Spin Polarization of Fe Nanoclusters

Observation of a high negative spin polarization at the Fe/MgO(100) surface oxidized at room temperature

Contact Info

Product

Resources

About

Interaction of O₂, CO and CO₂ with Co films

Interaction of O₂, CO and CO₂ with Co films