Patent ID: 9748471
Date: 2017-08-29
CPC Classifications: B82Y,G11C,H01F,H01L

Claim:
1. A spin transfer torque magnetic random access memory (STT-MRAM) device comprising a plurality of memory elements, each of said memory elements including a magnetic tunnel junction (MTJ) structure, said MTJ structure comprising: a magnetic free layer and a magnetic reference layer structure with an insulating tunnel junction layer interposed therebetween; a magnetic fixed layer exchange coupled to said magnetic reference layer structure through an anti-ferromagnetic coupling layer; a first perpendicular enhancement layer (PEL) formed adjacent to said magnetic free layer opposite said insulating tunnel junction layer; and a magnetic dead layer formed adjacent to said first PEL opposite said magnetic free layer, wherein said magnetic reference layer structure includes a first magnetic reference layer formed adjacent to said insulating tunnel junction layer and a second magnetic reference layer separated from said first magnetic reference layer by a second PEL, said first and second magnetic reference layers having a first invariable magnetization direction substantially perpendicular to layer planes thereof, said magnetic fixed layer has a second invariable magnetization direction that is substantially perpendicular to a layer plane thereof and is opposite to said first invariable magnetization direction, said magnetic free layer has a variable magnetization direction substantially perpendicular to a layer plane thereof.