Patent ID: 9159908
Filing Date: 2015-10-13
Classification: B82Y,G11C,H01F,H01L

Abstract:
1. A magnetic tunneling junction (MTJ) element in a magnetic device, comprising: (a) a pinned layer formed on a substrate; (b) a tunnel barrier layer that forms a first interface with the pinned layer; and (c) a composite free layer consisting of a stack of three ferromagnetic layers in a FL1/FL2/FL3 configuration wherein FL1 is a first crystalline ferromagnetic layer with a first thickness that forms a second interface with the tunnel barrier layer along a surface that is opposite to the first interface, FL2 is a second crystalline ferromagnetic layer that is Fe with a second thickness substantially greater than the first thickness, and contacts a top surface of the FL1 layer, and FL3 is an amorphous NiFeX layer where X is one of Hf, Zr, Nb, Ta, or Mg and X has a content between 5 and 12 atomic % in the NiFeX layer, the amorphous NiFeX layer is the uppermost layer in the FL1/FL2/FL3 stack.