The influence of the element shape on the switching of the magnetization in
dot arrays has been investigated using a joint in-field magnetic force mic
roscopy analysis and magneto-optical Kerr measurements. The single- or mult
iple-domain nature of the magnetization at remanence is shown to depend str
ongly on the aspect ratio of the elements and on how rounded or pointed eac
h element is. (C) 2000 American Institute of Physics. [S0021-8979(00)07514-
9].