Variation of the magnetic field strength along the jet axis measured from the jet base for two categories of simulations with high and low magnetization. The efficient transport of magnetic field in the high-B cases and its subsequent amplification near the jet head are clearly visible. In contrast, the low-B cases exhibit a more diffusive distribution, as the jet becomes more susceptible to small-scale MHD instabilities. The snapshot corresponds to the same evolutionary time shown in Fig. 6.