Mélica Franco N, Saavedra Eduardo, Escrig Juan, Bajales Noelia, Linarez Pérez Omar E, Arciniegas Jaimes Diana M
Universidad Nacional de Córdoba (UNC), Facultad de Ciencias Químicas, Departamento de Fisicoquímica, Haya de la Torre esq. Medina Allende, X5000HUA Córdoba, Argentina.
Universidad de Santiago de Chile (USACH), Departamento de Física, Av. Víctor Jara 3493, 9170124 Santiago, Chile.
Phys Chem Chem Phys. 2024 Feb 7;26(6):5621-5632. doi: 10.1039/d3cp05432b.
In this work we performed a detailed numerical analysis to investigate the static and dynamic magnetic properties of hexagonal cells of square and circular cobalt nanodots as a function of the distance between them and the external magnetic field to which they are subjected. By simulating hysteresis curves with the external magnetic field applied parallel and perpendicular to the plane of these nanostructures, we can conclude that the cobalt nanodots presented a significant perpendicular magnetic anisotropy. We also obtained that the coercivity increases with decreasing volume, which implies that the circular dots have a higher coercivity than the square dots. Furthermore, we studied the dynamic susceptibility of these systems and found that it is possible to control both the position and the number of resonance peaks by controlling the geometry and the distance between the magnetic nanodots. This work provides useful information on the behaviour of cobalt nanodot arrays, opening paths for the design and improvement of two-dimensional technological devices.
在这项工作中，我们进行了详细的数值分析，以研究方形和圆形钴纳米点的六边形单元的静态和动态磁性，作为它们之间距离以及所受外部磁场的函数。通过模拟在平行和垂直于这些纳米结构平面施加外部磁场时的磁滞曲线，我们可以得出结论，钴纳米点呈现出显著的垂直磁各向异性。我们还发现矫顽力随体积减小而增加，这意味着圆形点比方形点具有更高的矫顽力。此外，我们研究了这些系统的动态磁化率，发现通过控制磁性纳米点的几何形状和它们之间的距离，可以控制共振峰的位置和数量。这项工作为钴纳米点阵列的行为提供了有用信息，为二维技术器件的设计和改进开辟了道路。
