Patent ID: 7782574
Filing Date: 2010-08-24
Classification: G11B

Abstract:
1. A head, comprising: a read element having an air bearing surface for reading magnetic fields from a recording medium; a top read shield for shielding the read element from stray magnetic fields; a bottom read shield for shielding the read element from the stray magnetic fields, the bottom read shield having a thickness along the air bearing surface and a height perpendicular to the air bearing surface; a stray field shield for shielding the read element from the stray magnetic fields, the stray field shield having a thickness along the air bearing surface; and an exchange decoupling layer for providing exchange decoupling of the stray field shield and the bottom read shield; wherein the read element is located between the top read shield and the bottom read shield; wherein the bottom read shield is located between the stray field shield and the top read shield; wherein the exchange decoupling layer is located between the stray field shield and the bottom read shield; and wherein a ratio of the thickness of the stray field shield plus the thickness of the bottom read shield to the height of the bottom read shield is greater than 0.2.