Patent ID: 7888756
Filing Date: 2011-02-15
Classification: B82Y,G11B,G11C,H01F

Abstract:
1. A magnetic tunnel junction (MTJ) structure of the type having a tunnel barrier positioned between a fixed ferromagnetic layer and a free ferromagnetic layer, the tunnel barrier comprising: a first barrier layer contacting either the fixed ferromagnetic layer or the free ferromagnetic layer, wherein the first barrier layer transmits a high spin polarization and is selected from the group consisting of metal oxides, metal nitrides, and metal oxynitrides; and a second barrier layer contacting the first barrier layer, wherein the second barrier layer has a barrier height of less than about 0.5 eV and comprises TiO a third barrier layer formed on the second barrier layer and contacting the free ferromagnetic layer, the third barrier layer selected from the group consisting of metal oxides, metal nitrides, and metal oxynitrides, wherein the first barrier layer is formed on the fixed ferromagnetic layer and the second barrier layer is formed on the first barrier layer.