期刊刊名：修平學報 　 卷期：34期

篇名出版日期：2017年3月1日

作者：申繼陽,蔣忠誠,張晃暐,袁輔德,Chi-Yang Shen, Chung-Cheng Chiang, Huang-Wei Chang, Fu-Te Yuan

語言：English

關鍵字：FePt film, fuse quartz substrates, Cu-doping, Cr-doping, Magnetic properties, Microstructure,FePt膜,石英基板,Cu參雜,Cr參雜,磁性質,微結構

被點閱次數：0次

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摘要：
(FePt)₁-xCrx and (FePt)₁-xCux thin films were deposited on quartz substrates by high-vacuum RF sputtering. X-ray diffraction patterns show that addition of Cr or Cu results in the suppression of the ordering transformation process while annealing temperature (Ta) was lower than 700℃. For Ta = 800℃, both the Cr- and Cu-containing alloys complete the disorder-to-order phase transformation within 20 minutes. After annealing at 800℃, very high coercivity of 12 kOe was obtained in FePt-Cr thin film. On the other hand, the alloying of Cu was found to increase magnetization. Microstructures of the thin films were studied from TEM micrographs. Large grain size and grain-boundary precipitants were observed in 800℃ annealed FePt-Cr thin film. However, grain size refining was found in Cu-alloyed film. The ΔM curves were used to investigate the intergranular coupling. The ΔM values decrease with the increase of Cr concentrations. Whereas, the ΔM values increase with Cu concentration. It appears that the alloying of Cr decouples the grains while the addition of Cu results in strong exchange coupling.

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