Department of Applied Physics, Eindhoven University of Technology, Eindhoven, The Netherlands.
Nanotechnology. 2011 Jan 14;22(2):025302. doi: 10.1088/0957-4484/22/2/025302. Epub 2010 Dec 7.
We systematically study the effect of oxygen content on the magneto-transport and microstructure of Fe:O:C nanowires deposited by focused-electron-beam-induced (FEBID) deposition. The Fe/O ratio can be varied with an Fe content varying between ∼ 50 and 80 at.% with overall low C content (≈16 ± 3 at.%) by adding H(2)O during the deposition while keeping the beam parameters constant as measured by energy dispersive x-ray (EDX) spectroscopy. The room-temperature magnetic properties for deposits with an Fe content of 66-71 at.% are investigated using the magneto-optical Kerr effect (MOKE) and electric magneto-transport measurements. The nanostructure of the deposits is investigated through cross-sectional high-resolution transmission electron microscopy (HRTEM) imaging, allowing us to link the observed magneto-resistance and resistivity to the transport mechanism in the deposits. These results demonstrate that functional magnetic nanostructures can be created, paving the way for new magnetic or even spintronics devices.
我们系统地研究了氧含量对通过聚焦电子束诱导（FEBID）沉积沉积的 Fe:O:C 纳米线的磁输运和微观结构的影响。通过在沉积过程中添加 H(2)O，可以在保持束参数不变的情况下（通过能谱法 EDX 测量），将 Fe/O 比调节为 50-80 at.% 的范围内的 Fe 含量，同时总体保持低 C 含量（≈16 ± 3 at.%）。通过磁光克尔效应（MOKE）和电磁输运测量，研究了 Fe 含量为 66-71 at.% 的沉积物的室温磁性能。通过横截面高分辨率透射电子显微镜（HRTEM）成像研究了沉积物的纳米结构，使我们能够将观察到的磁电阻和电阻率与沉积物中的输运机制联系起来。这些结果表明，可以创建功能性磁性纳米结构，为新型磁性甚至自旋电子器件铺平道路。
