Preparation of Fe-Pt Nanowires through Anodic Oxidation of Sputtered Aluminum on Glass Surface
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Preparation of Fe-Pt Nanowires through Anodic Oxidation of Sputtered Aluminum on Glass Surface Satoru Inoue, Song-Zhu Chu, Kenji Wada, and Yasushi Kanke Advanced Materials Laboratory, National Institute for Materials Science, Namiki 1-1, Tsukuba 305-0044, Ibaraki, Japan ABSTRACT New process for the preparation of Fe-Pt nanowires has been developed through anodic oxidation and electro deposition technique. Aluminum thin film sputtered on ITO thin film on a glass surface was decomposed into alumina by anodic oxidation technique. The anodic alumina layer possessed nanometer size pore array standing on the glass surface. The barrier layer at the bottom of nanopores was removed by acid etching to attain DC field smooth electro deposition. Fe-Pt components were introduced into nanopores of anodic alumina by electro deposition. The magnetization of Fe-Pt nanowires was investigated. The magnetization perpendicular to the glass surface was very strong and the in-plane magnetization was very small, indicating that the magnetic Fe-Pt nanowires could be potentially applied to ultra high density magnetic recording. The density of the nanowires was estimated to be about 1T bits /inch2. INTRODUCTION The anodic oxidation of aluminum has been used as the method to convert the aluminum surface into alumina for the improvement of the chemical durability. The anodic oxidation technique is known as the self organization process to generate porous alumina where nanopores are arranged as perpendicular to the substrate. Recently nanostructured materials have attracted great interest for their potentiality leading to the unique functions in the optical properties, electronic properties, magnetic properties and mechanical properties. In these years, the porous anodic alumina has been studied to fabricate nanostructured materials [1~5]. The anodic oxidation of thin aluminum film has been studied recently on the sputtered aluminum film on the Ta [6] and the Si [7] substrate, resulting in the oxidation of the aluminum layer followed by the oxidation of the substrate. The authors have been studying the formation of the nanostructures on glass surfaces and have developed the new process in which the sputtered alumina film on conductive layer (tin-doped indium oxide (ITO)) on glass substrate was converted into the nanostructures by anodic oxidation [8]. The authors have also been studying the processes to introduce other compounds into nanopores of the anodic alumina using sol-gel technique and electro deposition. The TiO2 component could be introduced by sol-gel process [9,10] giving the high efficiency photo catalytic function [11]. The density of the nanopores of the alumina nanostructures on glass surface was estimated to be about 1000 Gbit / inch2 and the introduction of the magnetic components possessing easy magnetization axis perpendicular to substrate would be applicable to ultra high density magnetic recording media. The introduction of Ni metal could be attained by electro deposition process and the magnetization characteristics
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