磁気溶液堆積法における最大面積分率点に及ぼす粒子径分布の影響に関する解析

抄録

The generation of thin films of magnetic materials is a very important technology for various high-performance devices such as storage media. The capacity of storage media is increasing year by year, and further development is expected in the future. However, it is difficult to arrange nanoparticles in a regular pattern, so it is necessary to develop and establish a new generation method. Against this background, this research group has devised a magnetic solution deposition method as a new generation method. In this study, we used molecular fluid dynamics simulations to simulate the formation of clusters under conditions in which particle diameters are changed by standard deviation and particles with different diameters are mixed together. Specifically, we obtained the high-density limit point, which is the area fraction, and examined the relationship between the limit point and each physical property. As a result, we proposed a cluster formation coefficient that summarizes parameters such as the applied magnetic field, magnetic force, and Brownian motion, which enables us to easily derive conditions for thin film formation. We also showed that particle size variation has a significant effect on thin film formation, and that a squared or cubic functions of the standard deviation of particle size can sharply inhibit thin film formation. Furthermore, we showed that the reason for the high-density limit point of about 0.322 may be due to the unique circle shape of the nanoparticles.