A magnetic head contains a write magnetic head and a read magnetic head.
The write magnetic head includes a lower core layer, an upper core layer
arranged over the lower core layer, and a coil layer for applying a
magnetic field to the lower and upper core layers. The read magnetic head
includes an upper shield layer, a lower shield layer, and a reproducing
device arranged between the upper shield layer and the lower shield
layer. The upper shield layer has a dimension A in a direction of track
width and a dimension B in a direction of height and has an aspect ratio
B/A ranging from 0.6 to 1.2. The dimension A ranges from 75 .mu.m to 150
.mu.m.