LINEAR DEFECTS IN GMR MULTILAYERS

The deviations between the expected behavior of ideal antiferromagneti cally coupled multilayer systems and the experimentally observed featu res are explained by defects exhibiting ferromagnetic coupling along n arrow lines. Using a relaxation method, the two-dimensional magnetizat ion distribution around the defect has been calculated and the field d ependence of the mean magnetization as well as the resistivity have be en derived, The calculated curves show the typical features of irrever sibility known from experimental results.