US Patent 10374147 Perpendicular magnetic tunnel junction having improved reference layer stability

A magnetic data recording element for magnetic random access memory data recording. The magnetic data recording element includes a magnetic tunnel junction element that includes a magnetic reference layer, a magnetic free layer and a non-magnetic barrier layer located between the non-magnetic reference layer and the magnetic free layer. The magnetic reference layer includes a layer of Hf that causes the magnetic reference layer to have an increased perpendicular magnetic anisotropy. This increased perpendicular magnetic anisotropy improves reliability and stability of the magnetic data recording element by preventing loss of magnetic orientation of the magnetic reference layer such as during high writing current conditions.