Patent ID: 8472151

Claim:
A magnetoresistive element in a magnetic device, comprising: (a) a stack of layers comprised of a seed layer, anti-ferromagnetic (AFM) layer, and a pinned layer sequentially formed on a substrate; (b) a tunnel barrier layer made of MgO on the pinned layer; (c) a free layer having a trilayer configuration with a lower Fe or FeCo layer formed on the tunnel barrier layer, and a stack formed on the Fe or FeCo layer consisting of a first layer made of FeB, Co, CoFe wherein the Fe content is unequal to a Fe content in the FeCo layer, or Co U Fe W B Z where u is from about 1 to 95 atomic %, w is from 0 to about 70 atomic %, and z is from about 1 to 30 atomic %, and a second layer that is CoB X with a magnetostriction (λ) between about −5×10 −6 and 0; and (d) a capping layer on the free layer.