L1₀相　Fe-Ni-Ptの製膜と磁気特性

抄録

Since L1₀ ordered Fe-Pt has very high uniaxial magnetic anisotropy, it is an attractive candidate for ultra-high-density storage using heat-assisted magnetic recording. But its Curie temperature of 500 °C needs to be lowered if a temperature rise above the Curie temperature is to be achieved by the use of moderate laser power. Control of the Curie temperature was investigated in Fe_60-xNi_xPt₄₀ thin films sputtered on quartz glass substrates. L1₀ phase (001) texture was found in all the films with x = 0 to 24, indicating that the crystalline structure is L1₀ phase. XRD rocking curves revealed that the (001) orientation is much improved as x increases, while the order parameter S is gradually degraded, and magnetic anisotropy energy is decreased. A Curie temperature of around 300 °C, which may be suitable for heat-assisted magnetic recording, is obtained for x = 20 to 24.