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Carbon encapsulated iron nanoparticles(CEINPs) with very thin shells and good core-shell structures were prepared by DC arc discharge at argon intake temperature(AIT) of 800 ℃. The results of high resolution transmission electron microscope(HRTEM), energy dispersive X-ray(EDX) spectroscope, X-ray diffraction(XRD), and X-ray photoelectron spectroscope(XPS) characterizations on the product B show that the thickness of the carbon shells of CEINPs in the product B is in the range of ca. 0.5—5.3 nm, i. e., which can be as thin as only two layers of graphite. The average diameter of the CEINPs is about 24. 7 nm. The total content of Fe element in the product B is 77.0 wt%. The saturation magnetization(Ms) and coercivity(Hc) of the product B are 107.4 emu/g and 143 Oe, respectively. The formation of the CEINPs in the product B is discussed briefly. 相似文献
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室温下采用对向靶溅射方法制备了[CoTi]30及[CoCu(Ni)]30两组多层膜,并用小角X射线衍射和振动样品磁强计等方法研究多层膜的结构和磁性.发现CoCu(Ni)多层膜中饱和磁化强度Ms随非磁性层厚度ds的增加发生振荡变化;而CoTi多层膜中,Ms随ds的增加而单调减小.当ds>3.0nm时,两组多层膜的饱和磁化强度均趋向稳定.研究表明,Ms随非磁性层厚度ds的不同变化是由多层膜层间耦合效应引起的,用RKKY耦合和超交换耦合竞争机制理论可成功地解释这种实验现象. 相似文献
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