Patent ID: 6163442
Filing Date: 2000-12-19
Classification: G11B

Abstract:
A magnetic head assembly having an air bearing surface (ABS), comprising:a write head including:a ferromagnetic first pole piece bilayer having a yoke region between a pole tip region and a back gap region;a write gap layer on the first pole piece bilayer in the pole tip region and an insulation stack with at least one write coil embedded therein located on the first pole piece bilayer in the yoke region;a ferromagnetic second pole piece layer on the write gap layer and the insulation stack and magnetically connected to the first pole piece bilayer at said back gap region;the first pole piece bilayer including a first layer of nickel iron (NiFe) and a second layer of iron nitride (FeN) that are magnetically coupled with each other;each of the first and second layers of the first pole piece bilayer having a magnetic moment and a volume with the first layer having a negative magnetostriction and the second layer having a positive magnetostriction; andthe volume of the second layer being less than the volume of the first layer so as to cause the magnetic moment of the second layer to be pinned in a same direction as the magnetic moment of the first layer.