This study investigates the impact of a magnetic field on thermoelastic- diffusive half-space incorporating microconcentration, utilizing the three-phase-lag (3PHL) model and Green-Naghdi type II (G-N II) theory. The model is designed to be applied to magneto-thermoelastic systems, with a specific focus on cases where the material undergoes simultaneous thermal, magnetic and diffusive processes. The objective is to improve the understanding and prediction of thermoelastic interactions in these systems, which are relevant in a variety of engineering and technological applications. The analysis focuses on understanding how the magnetic field affects the propagation of thermoelastic waves in the absence and presence of diffusion and microconcentration. Analytical expressions of physical quantities are obtained through the application of normal mode method. When mechanical force is applied, the numerical results are provided and displayed graphically.Comparisons are made with results of (3PHL) model with and without diffusion, micro-concentration and magnetic field.