Patent ID: 9515253
Filing Date: 2016-12-06
CPC Classification: G01R,H01F,H01L

Claim Text:
1. A giant magnetoresistive (GMR) stack comprising: a seed layer; a pinning layer formed on said seed layer; a synthetic antiparallel (SyAP) layer formed on said pinning layer and magnetically coupled thereto, wherein said SyAP layer is formed as an antiferromagnetically coupled pair of ferromagnetic layers denoted AP1 and AP2, said ferromagnetic layers being separated by a non-magnetic coupling layer, and wherein layer AP2 is formed on said pinning layer; and wherein said AP1 layer incorporates a first plurality of insertion layers of the form Fe or FeX or multiple laminations thereof; an electrically conducting, non-magnetic spacer layer formed on said AP1 layer; a ferromagnetic free layer formed on said electrically conducting, non-magnetic spacer layer, said ferromagnetic free layer including a second plurality of insertion layers of the form Fe or FeX wherein X is one or more of the metallic, non-magnetic elements Ta, Hf, V, Mo, Zr, Nb or Ti, or multiple laminations of combinations thereof that are inserted to prevent interdiffusion and block crystallization; and a capping layer formed on said ferromagnetic free layer.