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11.
Synthesis, MSssbauer Spectra and Magnetic Properties of Quasi-One-Dimensional Fe3O4 Nanowires 下载免费PDF全文
Quasi-one-dimensional Fe3O4 nanowires in diameter of about 200nm were assembled into anodic aluminium oxide templates via electrodepositing and heat-treating processes. The nanowires have a polycrystalline spinel structure with α=8.317А, and each nanowire is composed of fine Fe3O4 crystallites with size of about 30nm. 相似文献
12.
采用直流磁控反应溅射在Si(100)衬底上溅射得到(001)取向的V2O5薄膜.x射线衍射(XRD)、扫描电镜(SEM)和傅里叶变换红外光谱(FTIR)的结果表明,氧分压影响薄膜的成分和生长取向,在氧分压0.4Pa时溅射得到(001)取向的纳米V2O5薄膜,即沿c轴垂直衬底方向取向生长的薄膜.V2O5薄膜经过真空退火得到(001)取向的VO2薄膜,晶体颗
关键词:
微观结构
氧化钒薄膜
择优取向
直流磁控溅射 相似文献
13.
利用电化学沉积方法在阳极氧化铝模板中制备了Fe89.7P10.3非晶 合金纳 米线阵列.利用x射线衍射仪、透射电子显微镜、振动样品磁强计和穆斯堡尔谱仪研究了样品的结构和磁性,发现纳米线阵列是非晶结构,且拥有垂直磁各向异性和高的矫顽力,Hc =304×104A/m.纳米线内部的平均超精细场和平均同质异能移分别为2 15×106 A/m和007 mm/s;而纳米线末端的平均超精细场(233×106 A/m )大于内 部的值,平均同质异能移(004 mm/s)小于内部的值.另外,纳米线内部Fe原子磁矩与线轴的夹角约为16°,而在纳米线末端Fe原子磁矩与线轴的夹角约为28°.这些结果表明,由于形状各 向异性,在纳米线中实现了无序非晶合金磁矩的有序排列.
关键词:
非晶合金
纳米线阵列
垂直磁各向异性
穆斯堡尔谱 相似文献
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The Fel00-xMox (13≤x ≤25) alloy nanowire arrays are synthesized by electrodeposition of Fe^2+and Mo^2+ with different ionic ratios into the anodic aluminum oxide templates. The crystals of Fel00-xMox alloy nanowires gradually change from polycrystalline phase to amorphous phase with the increase of the Mo content and the nanowires are of amorphous structure when the Mo content reaches 25 ate, which are revealed by the X-ray diffraction and the selected area electron diffraction patterns. As the Mo content increases, the magnetic hysteresis loops of Fel00-xMoz alloy nanowires in parallel to the nanowire axis are not rectangular and the slopes of magnetic hysteresis loops increase. Those results indicate that the magnetostatic interactions between nanowires and the magnetocrystalline anisotropy both have significant influences on the magnetization reversal process of the nanowire arrays. 相似文献
16.
通过微磁学模拟的手段对用电化学沉积法制备出的呈圆柱形的铁纳米线在常温下的磁行为进行了系统的研究,结果表明不同形状参量的铁纳米线都表现出磁各向异性,矫顽力随纳米线直径变化近似呈现平方反比关系,而对每一固定的直径,矫顽力随纳米线长度的增加而增大,最后趋向定值.磁滞回线形状、静态磁矩分布和反转机制等都随纳米线的直径和长度的变化而变化,对相应的规律给出了明确的解释.模拟结果显示实验上尚不能制备出的直径为5nm的纳米线呈现一致反转机理,同时还发现当纳米线过渡为颗粒时表现出更为复杂的性质
关键词:
纳米线
微磁学 相似文献
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18.
利用电化学沉积方法在阳极氧化铝模板中制备了Fe89.7P10.3非晶合金纳米线阵列.利用x射线衍射仪、透射电子显微镜、振动样品磁强计和穆斯堡尔谱仪研究了样品的结构和磁性,发现纳米线阵列是非晶结构,且拥有垂直磁各向异性和高的矫顽力,Hc=3.04×104A/m.纳米线内部的平均超精细场和平均同质异能移分别为2.15×106 A/m和0.07 mm/s;而纳米线末端的平均超精细场(2.33×106A/m)大于内部的值,平均同质异能移(0.04mm/s)小于内部的值.另外,纳米线内部Fe原子磁矩与线轴的夹角约为16°,而在纳米线末端Fe原子磁矩与线轴的夹角约为28°.这些结果表明,由于形状各向异性,在纳米线中实现了无序非晶合金磁矩的有序排列. 相似文献
19.
Remanence properties and magnetization reversal mechanism of Fe nanowire arrays with diameters 16nm and 130nm are studied. Isothermal remanent magnetization curves show that the contribution of irreversible magnetization decreases when the diameter changes from 16nm to 130hm. The remanence coercivities of these nanowires obtained in dc-demagnetization curve are about 2400 Oe and 800 Oe, respectively. The magnetization reversal mechanism is different in these two samples. For the nanowire array with diameter 16nm, both the nucleation and the pinning have effects on magnetization reversal mechanism, and the pinning field (about 2500 Oe) is larger than the nucleation field (about 2200 Oe). However, for the nanowire array with diameter 130nm, the magnetization reversal mechanism is dominated by the pinning effect of domain walls. 相似文献
20.
利用Landau-Lifshitz 方程,研究了具有非均匀交换各向异性的半无限大铁磁体的非线性表 面自旋波理论。导出了部分钉扎纯交换铁磁介质的磁化强度所满足的边界条件和非线性表面 自旋波的色散关系,并获得了自旋波振幅沿z方向驻波的一维非线性Schrdinger方程和包 络振幅沿平面传播的二维非线性Schrdinger方程,结果表明铁磁体磁化强度的包络振幅随时空变化的性质是由二维非线性Schrdinger方程决定的。因此预言铁磁介质的表面非线性激发应是二维孤波的形式。对于弱非线性表面自旋波,对非线性Schrdinger方程存在孤子形式解的可能性作了讨论.
关键词:
表面自旋波
Landau-Lifshitz方程
非线性Schrdinger方程
孤子 相似文献