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In thin magnetic films with strong perpendicular anisotropy and strongdemagnetizing field two ordered phases are possible. At low temperatures,perpendicularly oriented magnetic domains form a striped pattern. Astemperature is increased the system can undergo a spin reorientation transitioninto a state with in-plane magnetization. Here we present Monte Carlosimulations of such a magnetic film containing a periodic array of non-magneticdefects. We find that the presence of defects stabilizes parallel orientationof stripes against thermal fluctuations at low temperatures. Above the spinreorientation temperature we find that defects favor perpendicular spinalignment and disrupt long range ordering of spin components parallel to thesample. This increases cone angle and reduces in plane correlations, leading toa reduction in the spontaneous magnetization.

Magnetic stripe domain pinning and reduction of in plane magnet order due to periodic defects in thin magnetic films