Patent ID: 9172032
Filing Date: 2015-10-27
Classification: H01L

Abstract:
1. A perpendicular magnetic anisotropy (PMA) magnetic tunnel junction device, comprising: a tunneling dielectric layer having a first surface and a second surface; a reference layer having a magnetization direction fixed on a direction perpendicular to a surface of the reference layer and disposed on the first surface of the tunneling dielectric layer; a free layer having a magnetization direction parallel to or anti-parallel to the magnetization direction of the reference layer, and disposed on the second surface of the tunneling dielectric layer; and a capping layer consisted of magnesium, aluminum and oxygen, and disposed on the free layer, wherein the capping layer comprises: a magnesium oxide (MgO) layer disposed on the free layer and having a surface provided with a plurality of gaps; and an aluminum oxide (AlOx) layer filled in the gaps of the magnesium oxide layer.