FePtCu Films for Heat-Assisted Magnetic Recording Media Prepared from Cu/Pt/Fe Trilayers

Abstract

L10-ordered FePtCu ternary alloy thin films with (001) preferential orientation were fabricated from Cu/Pt/Fe trilayers to maintain their Curie temperature at a level suitable for the operating temperature of recording media in a heat-assisted magnetic recording (HAMR) system. It was confirmed that the addition of Cu to FePt films reduces the Curie temperature of the FePtCu films to a level lower than that of FePt films. The Cu content ratio of FePtCu films was controlled by adjusting the Cu layer thickness of the Cu/Pt/Fe trilayers. With increasing Cu thickness, their Curie temperature dropped below 300 degrees C and their perpendicular coercivity decreased to a sufficiently low level of about 1 kOe.

First-Principles Calculation of Curie Temperature Tuning in <i>L</i>1₀-Type FePt by Element Substitution of Mn, Cu, Ru, and Rh

“…Cu [9][10][11][12] , and 4d elements such as Ru 13) and Rh. 14,15) However, it is unclear which element is the most effective as the substitution element for reducing T C in FePt.…”