Abstract
Nickel thin films prepared in UHV on quartz glass substrates are shown by means of ferromagnetic resonance (FMR) to be either superparamagnetic (for d < 30 × 10 -10 m) or ferromagnetic (for d > 30 × 10 -10 m). Under UHV conditions the FMR-data change reversibly with H 2 or CO pressure and temperature. From the magnetic behaviour of d = 13 × 10 -10 m films chemisorption isotherms can be obtained, which are in good agreement with well known thermodynamical data. H 2 as well as CO adsorption on d = 150 × 10 -10 m films lead to non-monotonous shifts in the resonance field and microwave absorption. The results (resonance field, linewidth, lineshape and microwave absorption after different pretreatments) are discussed in terms of the FMR-theory of thin films. The influence of chemisorption on the magnetic moment, magnetic surface anisotropy and surface stress is estimated.
Published Version
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