Microstructure and magnetic properties of granular FePt/(FePt)₂₇Ti₇₃films for ultrahigh-density recording media^①

来源期刊：中南大学学报(英文版)2005年第2期

论文作者：于红云 孙会元 封顺珍 高凤菊 周鸿娟 聂向富 孙玉平

文章页码：155 - 158

Key words：FePt magnetic layer; ordered L1₀ structure; facing-target magnetron sputtering system; magnetic recording media

Abstract: FePt granular films were prepared by direct current facing-target magnetron sputtering system onto glass substrates and subsequently in-situ annealed in vacuum. Vibrating sample magnetometer, X-ray diffraction and scanning probe microscope were applied to study the magnetic properties, microstructures, morphologies and domain structures of the samples. (FePt)₂₇Ti₇₃ bilayer films were fabricated at various conditions to investigate the effect of Ti on FePt grains. The results show that without Ti matrix layer, FePt films deposited onto the glass substrates are fcc disordered; with addition of Ti matrix layer, FePt/Ti films form a ternary (FePt)₂₇Ti₇₃ alloy possessing fcc and L1₀(111) mixed texture. FePt/(FePt)₂₇Ti₇₃ films with perfectly ordered L1₀(111) structure and unique magnetic properties can be obtained at Ti thickness of 35 nm and substrate temperature of 250℃. The maximum coercivity is more than 240 kA/m and the squareness ratio is more than 0.9. The obtained results suggest that the granular FePt/(FePt)₂₇Ti₇₃ films can be applicable to ultrahigh-density magnetic recording media.