Magnetisation of a strongly paramagnetic layer in contact with a ferromagnetic substrate

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Abstract
The non-linear Ginzburg-Landau equation is solved numerically to determine the distribution of magnetisation in a strongly enhanced paramagnetic layer in contact with a ferromagnetic substrate. The magnetisation profiles and the dependences of the total magnetisation on the thickness of the paramagnetic layer are computed for the Ni-Pd interface investigated experimentally by Gradmann and Bergholz. All four possible regimes on the free surface of the paramagnetic layer, i.e. strongly enhanced, 'live' suppressed and neutral surfaces are considered. For a strongly enhanced (but not 'live') free surface, the Ginzburg-Landau model predicts a maximum in the thickness dependence of the magnetisation. The model also predicts that a thin paramagnetic layer with two free strongly enhanced surfaces can become ferromagnetic below a critical thickness which depends on the surface enhancement.
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