Patent ID: 8278123
Filing Date: 2012-10-02
Classification: B82Y,G01R,G11C,H01F,H01L

Abstract:
1. A method of manufacturing a magnetic tunnel junction device, the method comprising: a first amorphous ferromagnetic pinned layer deposition step of depositing a first amorphous ferromagnetic pinned layer; a second crystalline ferromagnetic pinned layer deposition step of depositing a second crystalline ferromagnetic pinned layer onto the first amorphous ferromagnetic pinned layer; a non-magnetic spacer layer deposition step of depositing a non-magnetic spacer layer onto the second crystalline ferromagnetic pinned layer; a first layer deposition step of depositing a first layer which contains ferromagnetic material onto the non-magnetic spacer layer; a tunnel barrier layer deposition step of depositing a tunnel barrier layer onto the first layer; and a second layer deposition step of depositing a second layer which contains ferromagnetic material onto the tunnel barrier layer, wherein the first layer deposition step comprises: a first amorphous ferromagnetic layer formation step of forming a first amorphous ferromagnetic layer, and a second crystalline ferromagnetic layer formation step of forming a second crystalline ferromagnetic layer, which is the preferred grain growth promotion (PGGP) seed layer, sandwiched by the first amorphous ferromagnetic layer and the tunnel barrier layer.