An enhanced recording head design provides thermal diffusion and thermal expansion
control in order to minimize the pole tip protrusion resulting from the thermal
heating of the magnetic recording head during operation. In one embodiment, the
recording head a thermal restraint section formed above a write section, and is
made of a 60-80% face-centered-cubic NiFe (Invar) material. According to another
embodiment, the thermal restraint section is formed under the read section. According
to yet another embodiment, one thermal restraint section is formed above the write
section, and another thermal restraint section formed under the read section.