Hybrid magnetic recording media on FePt grains and self-assembled nano-structured layers
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概要
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In this study, FePt or FeCuPt particles were fabricated by rapid thermal annealing method on two kinds of nano-structured substrates. In order to increase areal density of particles Np, nano-structred substrate was utilized. Two different kinds of nano-structured substrates were successfully prepared. One of them is a Nano-Dent Array (NDA) at the surface of SiO2 layer which is including closed packed nano-pores with periodicity of 14 nm was prepared by the polymer micelles technique and the other is Self-Assembled spherical small Silica Particles (SASP) with diameter of 18 nm was fabricated on Si substrates by the dip coating method. By utilizing NDA, average diameter Da of FeCuPt particles was successfully reduced and Np was drastically increased (Da = 4.8 nm, Np = 6.6 T particles/inch2 at the case of initially deposited Pt/Fe/Cu thickness is 1.25 nm) comparing to use of flat SiO2/Si substrate. Although FeCuPt particles was tended to grew up on convex part of NDA, the particles of over 10nm diameter that is near the same size with the diameter of nano-dent tend to grow up such ignoring of the nano-dent structures. On the other hand, preparing FePt on SASP under the condition of the resulted Da = 15 nm (initially deposited Pt/Fe thickness is 3.75 nm) which almost no effect was observed on NDA, Np (= 0.76 T particles/inch2) was four times increased compared with preparing on flat SiO2/Si substrate. It was found that starting from thinner initial bi-layer thickness of 1.88 nm Da decreased to around 5.1 nm and Np increased up to about 5.4 T particles/inch2. Furthermore, we observed the effect to structural and magnetic property of TbFeCo film by SASP substrate. Columnar structure was appeared and the magnetic Coercivity of TbFeCo continuous film was enhanced.
著者
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Itoh Akiyoshi
Dept. of Electronics and Computer Science, College of Science and Technology, Nihon Univ.
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Tsukamoto Arata
Dept. of Electronics and Computer Science, College of Science and Technology, Nihon Univ.
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Itoh A.
Dept.of Electronics and Computer Science, College of Sci.& Tech., Nihon University
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Tsukamoto A.
Dept. of Electronics and Computer Science, College of Sci. & Tech. Nihon University
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