Simulations are performed on clusters of finite size to study the effects of size and current-path structure on magnetotransport in spatially-confined samples.Magnetotransport networks are established and calculated based on fractal structures including Koch curves and percolation backbones extracted from regular lattices.The structure pattern of clusters is shown to play an important role in the magnetotransport behaviours by affecting the magnetoresistance fluctuations due to spin disorder in the systems of small size,which suggests the possibility of controlling the magnetotransport by the design of current-path configurations.
