1、本科毕业设计（论文）外文翻译 -1 1800 单词， 1 万英文字符，中文 2840 字 出处： Liu J R, Itoh M, Machida K. Magnetic and electromagnetic wave absorption properties of -Fe Z-type Ba-ferrite nanocompositesJ. Applied Physics Letters, 2006, 88(6): 062503. 原文 Magnetic and electromagnetic wave absorption properties of -Fe/Z-type Ba-fer
2、rite nanocomposites Jiu Rong Liu, Masahiro Itoh, and Ken-ichi Machidaa Center for Advanced Science and Innovation, Osaka University, 2-1 Yamadaoka Suita, Osaka565-0871, Japan (Received 16 August 2005; accepted 6 December 2005; published online 7 February 2006) The saturation magnetization values (Ms
3、) of -Fe / Ba3Co1.8Fe23.6Cr0.6O41 nanocomposites prepared by mechanically alloying -Fe with Ba3Co1.8Fe23.6Cr0.6O41 powders increased with increasing the concentration of -Fe. -Fe / Ba3Co1.8Fe23.6Cr0.6O41 nanocomposites showed higher coercivity values than -Fe and Ba3Co1.8Fe23.6Cr0.6O41 because of th
4、e effects of shape anisotropy and exchange bias. The resin compacts with 33.5 vol% -Fe/Ba3Co1.8Fe23.6Cr0.6O41 (38, 70, 85 vol% -Fe) powders provided good electromagnetic wave absorption performances in ranges of 7.5-16.0,5.4-10.5, and 4.3-8.3 GHz over the absorber thicknesses of 1.32.5, 1.63.0, and
5、1.73.2 mm, respectively. 2006 American Institute of Physics. DOI: 10.1063/1.2170402 Ferrites, as conventional electromagnetic (EM) wave absorbing materials, have been widely studied from megahertz to igahertz (GHz) range because of their strong magnetism and high electric resistivity13. For EM wave
6、applications there is an increasing interest in using ferrite-polymer lms rather than bulk ferrites. But, the thickness of ferrite-polymer lms has to be thick for efcient EM wave absorption, since it is difcult to increase the permeability values in GHz range owing to Snoeks limit for ferrites. Comparing with ferrites, metallic magnetic materials have large saturation magnetization values and their Snoeks limit is at a high frequency level4. Consequently,
