Stabilized Perpendicular Magnetic Anisotropy $\boldsymbol {L1_{1}}$ CoPtCu Thin Film at Room Temperature

In this paper, 4 nm-thick Co
₂₇
Pt
₅₀
Cu
₂₃
magnetic thin films were deposited on a (111)-textured Pt underlayer on a glass substrate at different substrate temperatures (T
_s
). Hard magnetic behaviors with outstanding perpendicular magnetic anisotropy (PMA) were obtained as T
_s
= RT - 400 °C. The result indicates the formation of superstructure L1
₁
CoPtCu(111) phase with easy axis aligning perpendicularly to the plane. Above 400 °C, the CoPtCu film showed soft magnetic properties. Ordered L1
₁
CoCuPt phase with PMA and high Ku value of about 5.7 × 10
⁵
J/m
³
is obtained at T
_s
= RT. The result suggests that RT-deposited L1
₁
CoPtCu thin film could be a potential candidate for magnetic sensor and spintronic device applications.