L10 FePt phase formation in Fe50Pt50(15 nm) and Ag(7.5 nm)/Fe50Pt50(15 nm) films on SiO2/Si(001) substrates

The effect of additional Ag top layer in Ag(0; 7.5 nm)/Fe
₅₀
Pt
₅₀
(15 nm) films on SiO
₂
(100 nm)/Si(001) substrates on L1
₀
phase formation and its magnetic properties after annealing in vacuum 1,3·10
^-3
Pa at 500-900°C for 30 s was studied by physical materials science methods. Film compositions are obtained by magnetron sputtering on SiO
₂
(100 nm)/Si(001) substrate. It is established that disordered A1 FePt phase is formed in as-deposited films. The ordered L1
₀
FePt phase forms in Fe
₅₀
Pt
₅₀
(15 nm) film during annealing at 700°C that is accompanied by sharp increase of coercivity, which continues to rise after further high temperature annealing. In film with Ag top layer, temperature of L1
₀
FePt phase formation increases to 800°C, but (001) texture in direction perpendicularly to substrate increases compared to the Fe
₅₀
Pt
₅₀
film.