Modifications of the electronic and magnetic properties of ultrathin Ni/Cu(100) films induced by stepwise oxidation

Tischer, M.; Arvanitis, D.; Russo, Maria Vittoria; Dunn, J. Hunter; Henneken, Heike; Wende, Heiko; Chauvistré, R.; Mårtensson, Nils; Baberschke, K.

doi:10.1103/physrevb.53.1076

Cited by 39 publications

(22 citation statements)

References 28 publications

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“…This is because the sharp structure located at 530 eV exactly originates from these hybridized 2p z 3d states. 23 Furthermore, the excellent statistics even allow for the identification of a small asymmetry in the O XMCD-i.e., the small positive contribution located at about 532 eV.…”

Section: Resultsmentioning

confidence: 99%

Induced magnetism of oxygen in surfactant-grown Fe, Co, and Ni monolayers

et al. 2006

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The well-known improvement of the layer-by-layer growth of ultrathin films of 3d ferromagnets by O surfactant is used to study the influence on their magnetism. X-ray magnetic circular dichroism ͑XMCD͒ reveals an induced magnetic moment of the O surfactant aligned in parallel to the 3d magnetization. In conjunction with density functional calculations we study the systematics of the x-ray absorption spectroscopy and XMCD at the O K edge.

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Section: Resultsmentioning

confidence: 99%

Induced magnetism of oxygen in surfactant-grown Fe, Co, and Ni monolayers

et al. 2006

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“…19 The worst contamination levels recorded in any sample by AES indicated a 4% oxygen component for the completed 600-Å Cu buffer and Ni layer. May has found that 0.5 ML of atomic oxygen suppresses the magnetization corresponding to one layer of Ni, and for 1.5 ML no ferromagnetic response from a 4-ML Ni film was found at 38 K. 33 Tischer et al also find effects of similar magnitudes in their ultrathin Ni films. 34 The information depth of the Auger was approximately 10 Å.…”

Section: Contamination Intermixing and Roughnessmentioning

confidence: 95%

Thickness dependence of the total magnetic moment per atom in the Cu/Ni/Cu/Si(001) system

et al. 1997

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Systematic measurements of the magnetic moment per Ni atom in Cu/Ni/Cu/Si͑001͒ structures have been made using polarized neutron reflection ͑PNR͒ for Ni thicknesses in the range 30 ÅϽtϽ400 Å at room temperature. We find a dramatic reduction in the magnetic moment per atom for tϽ100 Å and near bulk values above 100 Å. These results are corroborated by alternating gradient magnetometer measurements on the same samples. A Cu/Ni-wedge/Cu/Si͑001͒ structure with 30 ÅϽtϽ150 Å was studied using magnetic circular x-ray dichroism ͑MCXD͒, polar magneto-optical Kerr effect ͑MOKE͒, and reflection high-energy electron diffraction ͑RHEED͒ in order to estimate the variation in the values of ͗L z ͘, ͗S z ͘, perpendicular anisotropy strength, and surface in-plane Ni lattice constant, respectively, during epitaxial growth. RHEED measurements show that the in-plane lattice constant falls by 1.7% in the Ni thickness range 30 ÅϽtϽ90 Å. The MCXD measurements reveal the same trend for ͗L z ͘, ͗S z ͘, and total moment per atom versus Ni thickness as found for the total moment by PNR. Polar MOKE measurements confirmed the transition from a perpendicular easy axis towards an in-plane magnetic easy axis as has already been extensively studied in the literature. Comparison of the PNR results with RHEED measurements reveal a striking correlation between the increase of in-plane strain and reduction in magnetic moment per atom with decreasing Ni thickness. While a direct strain-induced variation of the moment based on bulk phase calculations cannot account for the magnitude of the moment variations we observe, we show that the results cannot be attributed to sample contamination, interdiffusion, or a reduction of the Curie temperature with decreasing Ni thickness. Furthermore, the presence of a magnetically dead layer in the samples is not consistent with the PNR results. The strong moment variation partially explains the large thickness range for which perpendicular anisotropy is observed in this system.

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“…For the comparatively weak ferromagnet nickel, the oxygen 22 and hydrogen 23 seriously affect the magnetization. The recent calculations 24 show, in accord with experiments, that CO kills the magnetization at the surface of Ni clusters.…”

Section: Introductionmentioning

confidence: 99%

Tight-binding study of the CO chemisorption effect on cobalt magnetization

Pick

Dreyssé

1999

Phys. Rev. B

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By using a semiempirical self-consistent tight-binding scheme we study the effect of O and CO chemisorption on the Co͑0001͒ surface magnetization. Similar calculations are performed for the Co 13 and Co 55 clusters of high symmetry. The CO molecule in the atop position, but not in the bridge geometry, is effective in local magnetization quenching. In clusters magnetic phase transitions are observed as the Co-CO separation varies. When the separation is more than about 1.8 Å, the Co magnetization remains strong. The character of phase transitions conforms to the formal predictions based on the Landau theory.

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Modifications of the electronic and magnetic properties of ultrathin Ni/Cu(100) films induced by stepwise oxidation

Cited by 39 publications

References 28 publications

Induced magnetism of oxygen in surfactant-grown Fe, Co, and Ni monolayers

Induced magnetism of oxygen in surfactant-grown Fe, Co, and Ni monolayers

Thickness dependence of the total magnetic moment per atom in the Cu/Ni/Cu/Si(001) system

Tight-binding study of the CO chemisorption effect on cobalt magnetization

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