A magnetic head for perpendicular recording having reduced side writing
and erasing is disclosed. The writer portion of the magnetic head
includes a main pole and a return pole. The main pole includes a
multilayer main pole tip and a multilayer yoke. The layers of the main
pole tip and the yoke are antiferromagnetically coupled to each other
with a non-magnetic metal. Antiferromagnetic coupling between the layers
of the main pole tip and the yoke dramatically reduces fringing flux
emanated from the sides of the main pole intending to close through an
upper portion of the return pole. A biasing antiferromagnetic layer is
coupled to the upper portion of the return pole to bias the return pole
parallel to the air bearing surface. This prevents or reduces the effect
of domain wall formation in the return pole, which results in further
reduction in side writing and erasing.