Fig. 1. Schematic diagram of the initial electron density for the partial nanolayered target.

Fig. 2. The magnetic field generated in the nanolayered target (a) with different electron density of and (b) with different fast electron current density of . The initial plasma density of the nanolayers is . The other parameters are and . The unit of the magnetic field here is  MG.

Fig. 3. (a) The distribution of the magnetostatic field at time . (b) The transverse distributions of self-generated magnetic fields at and are plotted. The blue solid curve is for the simulation result and the black dot curve is for the analytical result.

Fig. 4. The maximum intensity of the self-generated magnetic field versus the normalized intensity of the laser pulse. The unit of the magnetic field here is  MG. The blue dashed line stands for the simulation results and the black solid line stands for the theoretical analysis result.