▎ 摘　　要

We investigate a giant magnetoresistance (MR) effect in periodic, asymmetric magnetic superlattices (MSLs) on graphene. The MR ratio shows a strong dependence on both the interval of magnetic barriers and the asymmetry degree of the structures. With the increase of the number of periods, there is only one MR peak and the drift of the position of the peak appears around a specific Fermi energy. The highest value of the maximal MR ratio can be up to 10(17)%. Our studies indicate that the graphene-based asymmetric MSLs structure is an ideal candidate of a giant MR device, e. g., the magnetic reading device. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4757881]