Magnetic Properties and Microstructures of Granular (FePt)100-X-(Ag)X Thin Films
碩士 === 國立臺灣大學 === 材料科學與工程學研究所 === 89 === Abstract (Fe50Pt50)100-x-(Ag)x (x = 0~50 vol.%) granular thin films were prepared by dc co-sputtering of FePt and Ag targets on silicon wafer substrates, then post-annealed in vacuum at various temperatures. The effects of Ag volume fraction, film...
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| Format: | Others |
| Language: | zh-TW |
| Published: |
2000
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| Online Access: | http://ndltd.ncl.edu.tw/handle/96861556833973636192 |
| Summary: | 碩士 === 國立臺灣大學 === 材料科學與工程學研究所 === 89 === Abstract
(Fe50Pt50)100-x-(Ag)x (x = 0~50 vol.%) granular thin films were prepared by dc co-sputtering of FePt and Ag targets on silicon wafer substrates, then post-annealed in vacuum at various temperatures. The effects of Ag volume fraction, film thickness, annealing time and annealing temperatures on the magnetic properties parallel and normal to the film plane were investigated. The analyses of transmission electron microscopy indicated that the microstructure of the film is an crystalline Ag matrix with FePt particles dispersed in it, and the particle size of FePt increased with the annealing temperature. Saturation magnetization of the FePt-Ag film was independent of film thickness but inversely proportional to the Ag volume fraction. Variation of the films’ coercivity with film thickness was large. Maximum in-plane coercivity of the film was about 7 kOe, which occurred at 30 vol.% of Ag after annealing at 600 ℃ for 15 min. Average particle size of FePt in this film was about 30 nm. The magnetic properties and microstructure of these granular (Fe50Pt50)100-X — (Ag)X films after suitable annealing can be applied in high-density magnetic recording media.
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