Abstract: Magnetic hysteresis loops of Permalloy nanocap thin films are simulated using MuMax3, micromagnetic simulation program, to study the magnetic switching behavior of curved magnetic thin films such as nanocap. Four different shapes are introduced to construct a single nanocap used in the simulation. For a given shape, different thicknesses of the nanocap (20 nm, 40 nm, 80 nm, and 100 nm) with a fixed diameter of 400 nm, and different diameters of nanosphere (400 nm, 600 nm, 800 nm, and 900 nm) with a fixed thickness of 20 nm were studied in the simulation. Simulation results were compared to investigate how the thickness and diameter will change the magnetic switching behavior of nanocap thin films. Hysteresis loops showed more drastic change with varying the thickness compared to the diameter. To check how the different ways of distributing the same amount of material will affect the hysteresis loops, magnetic hysteresis loops of the nanocaps in four different shapes with the same volume were compared. Based on the comparison among the different shapes the one showing the hysteresis loops with well-defined coercivity was chosen and further simulations on extended shapes were made. Seven nanocaps in a hexagonal pattern were simulated to observe how the interaction among the nanocaps changes the magnetic switching behavior of the system. To remove the edge effect, seven nanocaps were extended to a grid pattern where it maintains the self-assembled pattern with periodic boundary conditions. It was found that magnetic vortices were more likely to form when there was interaction among the nanocaps. The magnetic switching behavior of the grid resembled the hexagonal pattern and the single nanocap when the diameter was 600 nm and higher.