Patent ID: 9006704
Filing Date: 2015-04-14
Classification: B82Y,G11C,H01F,H01L

Abstract:
1. A magnetic element exhibiting interfacial perpendicular anisotropy at first and second interfaces of a free layer with certain adjoining layers, comprising: (a) a pinned layer formed on a substrate; (b) a tunnel barrier layer that adjoins a surface of the pinned layer; (c) the free layer having a bottom surface which forms a first interface with a surface of the tunnel barrier that faces away from the pinned layer, and having a top surface that forms a second interface with a Hk enhancing layer, the free layer is a composite of two CoFeB magnetic layers wherein a Fe content in a first CoFeB magnetic layer is different from a Fe content in a second CoFeB magnetic layer and has perpendicular magnetic anisotropy (PMA); (d) the Hk enhancing layer that provides interfacial surface anisotropy in the free layer along the second interface such that interfacial perpendicular anisotropy at the first and second interfaces dominates a shape anisotropy field within the free layer; and (e) a capping layer that adjoins a top surface of the Hk enhancing layer to give a stack of layers with a pinned layer/tunnel barrier/free layer/Hk enhancing layer/capping layer configuration.