二维镍纳米带的磁性：结构相关的磁异常
Magnetic properties of 2D nickel nanostrips: structure dependent magnetic anomaly
摘要：
我们利用自旋密度泛函理论研究了不同几何形状的二维无限长且宽度不断增加的镍纳米线。我们的模拟结果表明，该基序是最稳定的结构，并将该基序是更稳定的矩形结构相比。导线是导电的，并且电导通道随着宽度的增加而增加。金属丝的弹道各向异性磁电阻比随磁化方向呈非线性变化。所有的二维纳米线以及Ni（111）和Ni（100）单层研究是铁磁性的Stoner标准下，表现出增强的磁矩相比，块体镍和相应的镍单层。斯通纳参数被认为取决于NWS的结构和尺寸。所有镍纳米线的易轴被观察到的调查是沿着线轴。与Ni（100）单层相比，双矩形纳米线表现出具有较小磁矩的磁异常，并且是唯一具有垂直于线轴的易轴的结构。
英文摘要：
We have investigated different geometries of two dimensional (2D) infinite length Ni nanowires of increasing width using spin density functional theory calculations. Our simulations demonstrate that the parallelogram motif is the most stable and structures that incorporate the parallelogram motif are more stable as compared to rectangular structures. The wires are conducting and the conductance channels increase with increasing width. The wires have a non-linear behavior in the ballistic anistropic magnetoresistance ratios with respect to the magnetization directions. All 2D nanowires as well as Ni (111) and Ni (100) monolayer investigated are ferromagnetic under the Stoner criterion and exhibit enhanced magnetic moments as compared to bulk Ni and the respective Ni monolayers. The Stoner parameter is seen to depend on the structure and the dimension of the Nws. The easy axis for all nickel nanowires under investigation is observed to be along the wire axis. The double rectangular nanowire exhibits a magnetic anomaly with a smaller magnetic moment when compared to Ni (100) monolayer and is the only structure with an easy axis perpendicular to the wire axis.
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