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Critical spin fluctuations of Ni monolayers at the Curie temperature: A magnetic resonance study in UHV (invited) : 35th annual conference on magnetism and magnetic materials San Diego, California (USA) 29 Oct − 1 Nov 1990 (1991)

Li, Yi ; Baberschke, K. ; Farle, M.

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 69 (1991), S. 4992-4996

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ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: Measurements of the critical behavior of the magnetic resonance linewidths ΔHpp from thin Ni(111) films on W(110) ranging in thickness from 15 to 40 A(ring) are presented. A huge peaklike broadening of ΔHpp is observed over a narrow temperature interval near the thickness-dependent Curie temperature TC(d). This peak results from the critical "speeding up'' of the relaxation rate Γ ∝ ΔHpp near TC due to spin fluctuations. This finding is discussed in relation to results on Gd monolayers, which show no critical broadening of the resonance linewidth. From the peak in ΔHpp, we directly determine TC(d), e.g., TC(15 A(ring))=512 K, and the shift exponent λ=1.42±0.3 for the thickness dependence of TC. Below TC, ΔHpp is analyzed in terms of the Landau–Liftshitz equation of motion, which yields ΔHpp ∝ (1 − T/TC)−β, with β the critical exponent of the spontaneous magnetization. A power law with β ranging from β=0.38 (bulk Ni) to 0.29 (15 A(ring)) is found for ≈ 10−3 ≤ (1 − T/TC) ≤ 6 × 10−2.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.348176

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Digitale Medien

High resolution x-ray absorption spectroscopy of linear hydrocarbons adsorbed on noble metal surfaces (1992)

Rabus, H. ; Arvanitis, D. ; Domke, M. ; [weitere]

College Park, Md. : American Institute of Physics (AIP)

The Journal of Chemical Physics 96 (1992), S. 1560-1573

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ISSN: 1089-7690

Quelle: AIP Digital Archive

Thema: Physik , Chemie und Pharmazie

Notizen: Recent progress in the performance of soft x-ray monochromators has revealed new features in soft x-ray molecular photoabsorption spectra. We present here a comprehensive high resolution x-ray absorption study on the linear hydrocarbons C2H2n and C2D2n, adsorbed on Ag(100) and Cu(100) at 50 K and in the solid and the gas phase. A line shape analysis is given, for the bound as well as for the continuum resonances and the absorption thresholds, by means of models easily accessible to the experimentalist, leading to a quantitative understanding of the observed spectra, including the vibrational envelopes. Changes in intramolecular bond lengths upon core-hole excitation can be determined and tracked as a function of deuteration and chemisorption. The effects of the substrate bonding on the vibrational envelopes are analyzed.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.462140

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Detailed analysis of the in situ magneto-optic Kerr signal of gadolinium films near the Curie temperature (1993)

Farle, M. ; Lewis, W. A. ; Baberschke, K.

Woodbury, NY : American Institute of Physics (AIP)

Applied Physics Letters 62 (1993), S. 2728-2730

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ISSN: 1077-3118

Quelle: AIP Digital Archive

Thema: Physik

Notizen: The temperature and magnetic-field-dependent Kerr signal of layer-by-layer grown 300 A(ring) Gd(0001) on W(110) is analyzed below and above the Curie temperature TC. The changes in the signal shape when passing through TC are discussed. We introduce a new and independent method for accurately determining TC in thin magnetic films in ultrahigh vacuum. As a consequence, discussions of the remanence, the field induced magnetization, and the critical exponent β become more transparent.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.109246

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