Abstract: Monte Carlo method is used to study magnetic properties of S=1/2 one-dimensional antiferromagnetic Ising diamond chain.In this system,due to antiferromagnetic interactions and trigonal structure,there exists spin frustration.The magnetic behaviors and spin configurations of the system are investigated with different antiferromagnetic interactions.Magnetization plateaus at M=M_S/3 are obtained in process of magnetization.Width of plateau exhibits variously for different antiferromangnetic interactions.Spin configurations are presented in the magnetization process as there appears the M=M_S/3 plateau and the system lies in a metastable state.Consequently,conditions in which the metastable state appears are concluded.In addition,hysteresis loops of the system are studied in different temperatures.With increase of temperature the hysteresis loops become more and more unobvious,and finally disappear.

Key words: spin frustration, Monte Carlo simulation, magnetization plateau, hysteresis loop