Patent ID: 9251816
Filing Date: 2016-02-02
CPC Classification: G01R,G11B

Claim Text:
1. An apparatus comprising a magnetic stack disposed between and contacting first and second shields, the first shield having at least one synthetic antiferromagnetic structure (SAFS) pinned by a high-coercivity ferromagnetic (HCFM) layer having a coercivity of at least 2000 Oe, the SAFS having first and second ferromagnetic layers each set with a first magnetization direction parallel to an easy axis of anisotropy by an annealing operation involving an application of heat and magnetization, the HCFM layer having a second magnetization direction oriented perpendicular to the first magnetization by a resetting operation involving an application of magnetization without heat, the second shield configured to provide asymmetrical shielding for the magnetic stack along a downtrack direction.