Nanoscaled magnetic fept films with additional au layer for ultrahigh density recording and information storage

Additional intermediate Au layer influence on the phase formation in Fe₅₀Pt₅₀/Au/Fe₅₀Pt₅₀ thin metallic films was investigated by methods of physical materials science. Au atoms are diffused in L1₀(FePt) phase grain boundaries and limited their growth at heat treatment. This results in reducing exchange magnetic interaction between grains and coercivity rise up to 27.5 kOe with the increase in Au layer thickness up to 30 nm. Additional interface energy in film composition and also stresses caused by Au and FePt lattice mismatch promote the FePt film ordering process. Au layer thickness increase up to 30 nm causes decrease in ordering temperature up to 600°C.