水素アニールによるFePt規則合金作製(ハード磁性材料)

概要

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The magnetic characteristics of FePt bilayers annealed in various atmospheres were investigated. The in-plane coercivity of FePt bilayers changed markedly in response to the annealing atmosphere. FePt bilayers annealed in hydrogen atmosphere exhibited coercivities of several kOe above 400℃. However, specimens annealed in nitrogen and argon atmosphere did not exhibit FePt ordered phase. X-ray photoelectron spectroscopy study clarified that the oxygen Introduced with Fe formed Fe_2O_3 and made interdiffusion between the Fe and Pt layers difficult. Suppression of inter-diffusion caused degeneration of ordered FePt phase. Annealing in hydrogen atmosphere was found to be effective for removing the oxygen, and led to the formation of FePt ordered phase during the annealing. Moreover, specimens annealed in a high-pressure hydrogen atmosphere showed higher in-plane coercivity than specimens annealed under low pressure. High-pressure annealing also decreased the ordering temperature from 400℃ to 350℃.
社団法人日本磁気学会の論文
2004-03-01