Abstract
Numerical simulations are developed to describe consistently the magnetization reversal processes and magnetic domain structures in ferromagnetic ultrathin Au/Co(0.8 nm)/Au sandwiches deposited on glass substrate. The ultrathin cobalt film shows: (i) an easy magnetization axis perpendicular to film plane; (ii) magnetic after-effect and irreversibility of magnetization processes; (iii) a lacunar Swiss cheese type of domain structure; (iv) different initial magnetization curves depending on the demagnetizing procedure for in-plane or out-of-plane magnetic field. Experimental results are well described by numerical simulations considering the detailed sample morphology. The magnitude of the magnetic coupling between cobalt crystallites located at the gold crystallites boundaries is found far weaker than for other cobalt crystallites.
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