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Up to now, only few results have been reported on the magnetization reversal of films with columnar structure and perpendicular easy axis under the influence of dipolar coupling 1-6. To our knowledge, only one team has ~erformed studies on regular 2D arrays of perpendicularly magnetized dots with dipolar interaction 7, • In all these cases, the lack of homogeneity and the dispersion of nucleation fields in the studied systems prevented to retrieve valuable data concerning the influence of dipolar coupling on the collective magnetization reversal of particles, and also the local studies were hampered by these drawbacks. The aim of the present contribution was to investigate into detail the effect of dipolar coupling on the local and collective magnetization reversal of a very well characterized system of perpendicularly magnetized dots. This effect will be important in future ultrahigh density magnetooptical (MO) recording applications where written bits have to be reduced in dimension and closely packed. MO Faraday effect magnetometry measurements and imaging have been used to investigate the static and dynamic magnetic properties of two-dimensional arrays of rectangular dots. The arrays were fabricated in highly homogeneous ultrathin epitaxial Pt(3.4nm)/Co(1.4nm)lPt(4nm)!Alz0 3(OOOl) sandwiches with high perpendicular anisotropy and easy domain wall propagation. Arrays were patterned directly by writing regularly spaced lattices of crossed lines using high resolution focused ion beam (FIB) etching at very low doses of Ga+ ions. In this way, the film surface stays even (there is no milling of grooves) and the created pattern is of purely magnetic nature. This causes very little optical contrast, allowing MO imaging of the same quality as in continuous films. The dots are separated from each other by narrow paramagnetic stripes

Magnetization Reversal of Arrays of Micron Sized Dots under the Influence of Dipolar Coupling