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By means of three dimensional resistive-magnetohydrodynamical models, westudy the evolution of the so-called dead zones focused on the magnitude of theReynolds and Maxwell stresses. We consider two different types of staticresistivity radial profiles which give rise to an intermediate dead zone or anintermediate active zone. As we are interested in analyzing the strength ofangular momentum transport in these intermediate regions of the disc, we use asfree parameters the radial extent of the intermediate dead ($\Deltar_\mathrm{idz}$) or active ($\Delta r_\mathrm{iact}$) zones, and the widths ofthe inner ($H_{b_1}$) and outer ($H_{b_2}$) transitions. We find thatregardless of the width or radial extent of the intermediate zones, Rossby waveinstability (RWI) develops at these transition boundaries, leading to theemergence of vortices and spiral waves. In the case of an intermediate deadzone, when $H_{b_1}\,,H_{b_2}\leq0.8$, the vortices are almost completelyconfined to the dead zone. Remarkably, we find that the formation of vorticesat the inner transition can drag magnetic field lines into the dead zonestirring up the region that the vortex covers (reaching an$\alpha\approx10^{-2}$ value similar to that of an active zone). Vorticesformed in the outer transition only modify the Reynolds stress tensor. Ourresults can be important to understanding angular momentum transport in poorlyionized regions within the disc due to magnetized vortices within dead zones.

Turbulent stress within dead zones and magnetic field dragging induced by Rossby vortices