Escobar A, Moctezuma R E, Donado F
Instituto de Ciencias Básicas e Ingeniería, Universidad Autónoma del Estado de Hidalgo, 42184, Mineral de la Reforma, Hidalgo, México.
Conacyt- Instituto de Física, Universidad Autónoma de San Luis Potosí, Álvaro Obregón 64, 78000, San Luis Potosí, S.L.P., México.
Sci Rep. 2025 Jan 6;15(1):1030. doi: 10.1038/s41598-024-84285-4.
We study experimentally the optimisation of the crystallisation process through a 2D-dimensional system of magnetic particles under an oscillating magnetic field. The time-dependent magnetic field fluidises the system, and by varying its magnitude, the effective temperature of the system is controlled. The system exhibits fluid-like behaviour when the effective temperature is high and evolves to a crystalline arrangement when the temperature is slowly lowered in linear cooling. We found that replacing the linear cooling path with a staggered one let us find the conditions to crystallise the system quicker than using linear cooling. We determine the minimum time required for the particles to find their minimum energy configuration at each temperature step. We found that the crystallisation time was considerably reduced using this method, which allowed us to optimise the crystallisation time.
我们通过二维磁性粒子系统在振荡磁场下对结晶过程的优化进行了实验研究。随时间变化的磁场使系统流化，通过改变其大小来控制系统的有效温度。当有效温度较高时，系统呈现出类似流体的行为，而在线性冷却过程中当温度缓慢降低时，系统会演变成晶体排列。我们发现，用交错冷却路径取代线性冷却路径，能让我们找到比使用线性冷却更快使系统结晶的条件。我们确定了在每个温度步骤中粒子找到其最低能量构型所需的最短时间。我们发现使用这种方法可大幅缩短结晶时间，从而实现了结晶时间的优化。
