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Magnetization reversal in individual cobalt micro- and nanowires grown by focused-electron-beam-induced-deposition

机译：聚焦电子束诱导沉积生长的单个钴微细线和纳米线的磁化反转

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摘要

We systematically study individual micro- and nanometric polycrystalline cobalt wires grown by focused-electron-beam-induced-deposition. The deposits were grown in a range of aspect ratios varying from 1 up to 26. The minimum lateral dimension of the nanowires was 150 nm, for a thickness of 40 nm. Atomic force microscopy images show beam-current-dependent profiles, associated with different regimes of deposition. The magnetization reversal of individual nanowires is studied by means of the spatially resolved magneto-optical Kerr effect. Abrupt switching is observed, with a systematic dependence on the wire’s dimensions. This dependence of the coercive field is understood in magnetostatic terms, and agrees well with previous results on cobalt wires grown with different techniques. The influence of compositional gradients along the structural profile on the magnetic reversal is studied by using micromagnetic simulations. This work demonstrates the feasibility of using this technique to fabricate highly pure magnetic nanostructures, and highlights the advantages and disadvantages of the technique with respect to more conventional ones.
机译：我们系统地研究了通过聚焦电子束诱导沉积法生长的单个微米和纳米级多晶钴线。沉积物的长径比范围从1到26不等。纳米线的最小横向尺寸为150 nm，厚度为40 nm。原子力显微镜图像显示了与束流有关的轮廓，与不同的沉积方式相关。通过空间分辨的磁光克尔效应研究了单个纳米线的磁化反转。观察到突然切换，并且系统地依赖于导线的尺寸。矫顽场的这种依赖性可以用静磁的方式理解，并且与以前用不同技术生长的钴线的结果非常吻合。通过使用微磁模拟研究了成分梯度沿结构轮廓对逆磁的影响。这项工作证明了使用该技术制造高纯度磁性纳米结构的可行性，并突出了该技术相对于传统技术的优缺点。

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