第四届国际复合材料会议介绍

<正> 复合材料是新型高性能材料,它能满足多种多样材料性能的要求,由于对节约能源及保存自然资源所起的作用而愈来愈引起世界范围的重视。第四届国际复合材料会议(ICCM—Ⅳ)于1982年10月24日至20日在东京举行。参加会议的代表465人,遍及24个国家。大会主席、日本著名复合材料专家林毅教授作了“日本复合材料概况”的报告,另有6篇大会报告是:A.Kelly的“复合材料在工程上的应用”(英)、G.S.

Magnetic Properties of FePt Nanoparticles Prepared by a Micellar Method

FePt nanoparticles with average size of 9 nm were synthesized using a diblock polymer micellar method combined with plasma treatment. To prevent from oxidation under ambient conditions, immediately after plasma treatment, the FePt nanoparticle arrays were in situ transferred into the film-growth chamber where they were covered by an SiO2 overlayer. A nearly complete transformation of L1(0) FePt was achieved for samples annealed at temperatures above 700 A degrees C. The well control on the FePt stoichiometry and avoidance from surface oxidation largely enhanced the coercivity, and a value as high as 10 kOe was obtained in this study. An evaluation of magnetic interactions was made using the so-called isothermal remanence (IRM) and dc-demagnetization (DCD) remanence curves and Kelly-Henkel plots (Delta M measurement). The Delta M measurement reveals that the resultant FePt nanoparticles exhibit a rather weak interparticle dipolar coupling, and the absence of interparticle exchange interaction suggests no significant particle agglomeration occurred during the post-annealing. Additionally, a slight parallel magnetic anisotropy was also observed. The results indicate the micellar method has a high potential in preparing FePt nanoparticle arrays used for ultrahigh density recording media.

The Holocene Asian monsoon: Links to solar changes and North Atlantic climate

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