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The ferromagnetic order and the critical exponentγ of Gd monolayers and thin films on W(110)

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Abstract

The new application of electron-spin resonance to paramagnetic monolayers on well characterized surfaces (LEED, AES) in UHV is described. The high sensitivity of ESR is demonstrated for 10−2 monolayers NO2 adsorbed on Xe/Ag(111), corresponding to ≈1012 detectable molecules. For monolayers of Gd(0001) on W(110) the critical exponentγ of the susceptibility and the ordering temperatureT c are determined by analysing the ESR intensity and resonance field forT→T +c . Both determinations independently give a monolayerT c of app. 271 K. The critical exponentγ changes from 2D to 3D Ising-values for monolayers to thicker films.

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Authors and Affiliations

  1. Institut für Atom- und Festkörperphysik, Freie Universität, D-1000, Berlin 33

    K. Baberschke, M. Farle & M. Zomack

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  1. K. Baberschke
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  2. M. Farle
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  3. M. Zomack
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Baberschke, K., Farle, M. & Zomack, M. The ferromagnetic order and the critical exponentγ of Gd monolayers and thin films on W(110). Appl. Phys. A 44, 13–18 (1987). https://doi.org/10.1007/BF00617887

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