On the magnetic properties of iron nanostructures fabricated via focused electron beam induced deposition and autocatalytic growth processes
On the magnetic properties of iron nanostructures fabricated via focused electron beam induced deposition and autocatalytic growth processes
复制标题
通过聚焦电子束诱导沉积和自催化生长过程制备铁纳米结构的磁性
作者：
Fan Tu;Martin Drost;F. Vollnhals;Andreas Späth;Esther Carrasco;Rainer H. Fink;H. Marbach
我们采用电子束诱导沉积（EBID）结合自催化生长（AG）工艺来制备具有可控形状和厚度的磁性纳米结构。按照这条路线，不同的铁沉积在超高真空条件下制备氮化硅膜和研究的扫描电子显微镜（SEM）和扫描透射X射线显微光谱（STXM）。最初沉积的Fe纳米结构由纯铁组成，特别是当通过自催化生长过程制造时。采用定量近边X射线吸收精细结构（NEXAFS）光谱来获得厚度依赖的组合物上的信息。使用STXM中的X射线磁性圆二色性（XMCD）来推导EBID制备的结构的磁性。STXM和XMCD分析表明在沉积-真空界面处存在薄的氧化铁层，该氧化铁层是在暴露于环境条件期间形成的。我们能够从XMCD显微照片中提取具有不同外部磁场的单个沉积物的磁滞回线。在所研究的厚度范围内（2-16 nm），从磁滞回线的宽度评估的磁性，随着存款厚度增加，并在约10 nm处达到最大值160 Oe。总之，我们提出了一种可行的技术，以可控的方式制造铁磁纳米结构，并详细了解其化学和磁性。
We employ Electron beam induced deposition (EBID) in combination with autocatalytic growth (AG) processes to fabricate magnetic nanostructures with controllable shapes and thicknesses. Following this route, different Fe deposits were prepared on silicon nitride membranes under ultra-high vacuum conditions and studied by scanning electron microscopy (SEM) and scanning transmission x-ray microspectroscopy (STXM). The originally deposited Fe nanostructures are composed of pure iron, especially when fabricated via autocatalytic growth processes. Quantitative near-edge x-ray absorption fine structure (NEXAFS) spectroscopy was employed to derive information on the thickness dependent composition. X-ray magnetic circular dichroism (XMCD) in STXM was used to derive the magnetic properties of the EBID prepared structures. STXM and XMCD analysis evinces the existence of a thin iron oxide layer at the deposit–vacuum interface, which is formed during exposure to ambient conditions. We were able to extract magnetic hysteresis loops for individual deposits from XMCD micrographs with varying external magnetic field. Within the investigated thickness range (2–16 nm), the magnetic coercivity, as evaluated from the width of the hysteresis loops, increases with deposit thickness and reaches a maximum value of ∼160 Oe at around 10 nm. In summary, we present a viable technique to fabricate ferromagnetic nanostructures in a controllable way and gain detailed insight into their chemical and magnetic properties.
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影响因子：
3.1
作者：
Vollnhals F;Drost M;Tu F;Carrasco E;Späth A;Fink RH;Steinrück HP;Marbach H
通讯作者：
Marbach H
影响因子：
15
作者：
Hocking, Rosalie K.;Wasinger, Erik C.;Solomon, Edward I.
通讯作者：
Solomon, Edward I.
薄膜与块状基板：聚焦电子束诱导加工中邻近效应的研究
DOI：
10.1088/0022-3727/45/22/225306
发表时间：
2012
期刊：
Journal of Physics D: Applied Physics
影响因子：
--
作者：
M.-M. Walz;F. Vollnhals;F. Rietzler;M. Schirmer;A. Kunzmann;H.P. Steinrück;H. Marbach
通讯作者：
H. Marbach
DOI：
10.1007/s00339-014-8578-x
发表时间：
2014-11-01
影响因子：
2.7
作者：
Marbach, Hubertus
通讯作者：
Marbach, Hubertus
影响因子：
3.1
作者：
Dobrovolskiy OV;Kompaniiets M;Sachser R;Porrati F;Gspan C;Plank H;Huth M
通讯作者：
Huth M