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The interrelation between Ferreira's Hopf solitons of a conformal nonlinear$\sigma$ model and the electromagnetic knots found by Ra$\tilde{\rm{n}}$ada etal. is investigated. It is shown that the electromagnetic knots yield exactsolutions of the conformal nonlinear $\sigma$ model different from thoseobtained by Ferreira. Conversely, It is discussed that Ferreira's solutionsrealize magnetic knots. The energy associated with these two kinds of knots arecompared. The structure of the electric charge distribution and the electriccurrent density associated with the magnetic knots is investigated.

Cross-fertilization of Ferreira's Hopfions And Electromagnetic Knots