A method and apparatus providing a stabilized top shield in a read head
used for the longitudinal or perpendicular magnetic recording is
disclosed. The top shield includes a laminate structure including at
least three layers of ferromagnetic and antiferromagnetic films in a
frame. Unidirectional anisotropy induced at the interface of the
ferromagnetic and antiferromagnetic films is optimized by selecting
suitable compositions and thicknesses to achieve the stabilization of the
top shield while maintaining high permeability. In an alternative method,
the top shield includes a ferromagnetic Ni--Fe film in a central region
and multiple layers comprising ferromagnetic Co--Fe and Ni--Fe layers and
an antiferromagnetic layer. Unidirectional anisotropy induced at the
interfaces of ferromagnetic and antiferromagnetic layers by selecting
suitable compositions and thicknesses of the ferromagnetic and
antiferromagnetic layers to achieve the stabilization of the top shield
through magnetostatic interactions between the central and side regions.