An aspect of at least one embodiment of the present invention is a device for cracking heavy hydrocarbons. A linear applicator is positioned within heavy oil containing aromatic molecules. A radio frequency electrical current source is electrically connected to the applicator at a first connection point and a second connection point to create a closed electrical loop. The radio frequency source is configured to apply a signal to the applicator that is sufficient to create a magnetic field and an electric field relative to the axis of the linear applicator. The device also includes a chamber positioned around the applicator generally between the first connection point and the second connection point to concentrate the magnetic field within a region surrounding the applicator and containing the heavy hydrocarbons.