L1_0相Fe-Ni-Ptの製膜と磁気特性(磁気記録)

概要

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Since L1_0 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℃ 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-x>Ni_xPt_<40> thin films sputtered on quartz glass substrates. L1_0 phase (001) texture was found in all the films with x=0 to 24, indicating that the crystalline structure is L1_0 phase. XRD rocking curves revealed that the (001) orientation is much improved as x increases, while the order parameter S is gradually degraded, and the magnetic anisotropy energy is decreased. A Curie temperature of around 300℃, which may be suitable for heat-assisted magnetic recording, is obtained for x=20 to 24.
社団法人日本磁気学会の論文
2006-03-01