Magnetic properties of pattern nanowire arrays and its application in perpendicular recording (マルチメディアストレージ第6回アジア情報記録技術シンポジウム〔英文〕)

概要

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Highly pattern anodic aluminum oxide(AAO)was prepared by two steps anodic process. Uniform arrays of Co, Fe, Ni, CoNi and CoPt alloy nanowires were fabricated by electrochemical deposition. The micrographies and crystalloid structures of nanowires were studied by TEM, SEM, AFM and XRD. The magnetic properties were investigated by Mossbauer Spectrum(MS), Vibrating Sample Magnetometer and MFM. It was found that in the case of single metal nanowire arrays, the squareness(Mr/Ms)and coercivity of the hysteresis was very high when the external field was applied perpendicular the sample, which showed strong perpendicular anisotropy. XRD and Mossbauer show that preferred orientation existed in the case of Fe or Co nanowires. The magnetic properties were very complicate in alloy nanowire arrays. MFM results show that patterned single-domain structure existed in magnetic nanowire arrays with small diameter. The recording density could be as high as 100Gbit/cm^2 if each single-domain element represents a bit of binary information, which was very attractive in highly density recording.
社団法人映像情報メディア学会の論文
2001-11-07