MPT Tool: A Parameter Extraction Tool for Accurate Modeling of Magnetic Tunnel Junction Devices

Until now, many models of magnetic tunnel junction (MTJ) devices have been reported in the literatures, which are very helpful for behavior simulations in spintronic circuit design and simulation. However, there are few reports on how to obtain the accurate modeling parameters, as well as the accurate simulation of the complete flow from device parameters to device modeling and hybrid MTJ/CMOS circuits. One of the difficulties in obtaining the accurate MTJ modeling results is the lack of experimental parameters. The parameters in the MTJ models should be precisely identified to obtain accurate simulation results. However, in the reported models, many parameters are theoretically set instead of actual extraction. In this paper, a parameter extraction tool, named MPT tool, is proposed for the accurate modeling of the MTJ devices. In the MPT tool, the measured results of the MTJ devices are adopted as the input. There are two main functions of the MPT tool. One is the parameter extraction based on the input experimental results. The other is the parameter optimization based on the specific algorithm. In the tool, the simulated annealing (SA) optimization algorithm is applied to optimize the extracted parameters. The parameters of the extraction procedure and the modeling results based on the parameters of the optimization procedure are compared with the experimental data, respectively. The proposed extraction procedure and the optimization procedure together with the adopted MTJ model is as an efficient approach to improve the accuracy of the simulation result.