## 1 Introduction  
The one-dimensional (1D) nanomaterials have attracted much attention from the scientific community due to their functional utilization in the fabrication of optoelectronic and magnetic devices [1]. The transition-metal elements such as iron (Fe), cobalt (Co) and nickel (Ni), which have 1D nanostructures, have shown promising applications, such as in magnetic memory bits, magnetic sensors and high-density data-storage devices [2]. Their structures, possessing 1D features, exhibit unique properties, such as high aspect ratio, which can be effectively utilized for the fabrication of interconnections in devices at nanoscale. This reduces the size and weight of a device, and enhances their portability [3].  
Among all the magnetic elements, ferromagnetic Ni is of particular interest. Due to its low magnetocrystalline anisotropy, it gives rise to enhanced magnetic properties that make it useful for the fabrication of various magnetic devices [4; 5]. Along with magnetocrystalline anisotropy, 1D Ni nanostructures also exhibit a negative magnetostriction value, which makes it effective for the study of various magnetic phenomena, such as magnetization reversal, the switching behavior of magnetic fields, magnetoresistance etc. [6; 7]. Magnetic anisotropy can affect the magnetic properties of a material to a great extent. For instance, [PERSON] et al. have studied the effect of magnetic anisotropy on the temperature-dependent magnetic properties of Ni nanowires and found that magnetic anisotropy increases with temperature causing increase in coercivity [7]. Similarly, the magnetotransport properties of Ni nanowires have also been investigated qualitatively by another research group, using an anisotropic magnetoresistance model [6; 8]. Therefore, the 1D nanostructures of Ni, such as nanorods, nanobelts, nanowires etc. have been fabricated by employing various methods, such as template-assisted electrodeposition [3], electrodeposition into track-etched polymer membranes [9], chemical vapor deposition (CVD) and facile wet chemical reduction [10] etc. It is noteworthy that the control of the orientation of the easy direction in 1D structures through chemical methods is not easy; however, it can be achieved by employing various strategies [11].  
In this paper, we have conducted a solution reduction experiment, and manufactured Ni wires with different shapes, with and without the application of magnetic fields, and investigated the effect of shape of the magnetic field on the magnetization and magnetocrystalline anisotropy of Ni wires. The advantage of applying the magnetic field during synthesis is that the easy axis of all the particles can be aligned along the wire axis. In this way, during the course of the fabrication of a wire, the magnetic field may align along the preferred crystalline orientation of the wire's axis [11]. Here, magnetic fields were applied in different geometrical shapes, such as square-type, single side and ring-type, with an intensity of 500 Gauss, as described in the Methods section. We have evaluated the structural, microstructural, and magnetic properties of nickel wires through X-ray diffraction analysis, high-resolution field emission scanning electron microscopy and DC magnetization.