  The ability to spatially separate the electric and magnetic fields of a light
beam enables the inspection of laser-matter interactions driven solely by
optical magnetic fields. However, magnetic field excitations are commonly
orders of magnitude weaker than those driven by the electric field. Several
studies have already demonstrated the isolation of an intense, linearly
polarized magnetic field using structured light. In this work, we report the
generation of isolated high intensity magnetic fields with controlled
polarization state in the non-paraxial regime using structured laser beams. Our
theoretical findings highlight a significant enhancement in the amplitude of
the longitudinal magnetic field carried by an azimuthally polarized laser under
tight-focusing conditions. Furthermore, by implementing a multiple-beam
configuration, we achieve precise control over the polarization state and
amplitude of the spatially isolated magnetic field. We report the generation of
polarization-controlled magnetic fields reaching up to tens of Tesla, even from
moderately intense laser beams of $\sim 10^{12} \, \mathrm{W}/\mathrm{cm}^2$.
Our study paves the way for ultraintense interactions with circularly polarized
magnetic fields from a feasible experimental setup point of view, particularly
interesting to probe ferromagnetic materials and chiral media.
