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We discuss the magnetic moments of the baryons allowing for flavor symmetrybreaking in the quark magnetic moments. We show that there is a correlationbetween isospin symmetry breaking and data for the nucleon spin structureobtained from deep inelastic scattering. For small values of the isospinsymmetry breaking, of the order of $5\%$, the magnetic moments and weakaxial-vector form factors alone indicate a value of the spin polarization$\Delta\Sigma \leq 0.20$. Larger values of the spin polarization are compatibleonly with large isospin symmetry breaking. We also calculate weak axial-vectorform factors, which are independent of the symmetry breakings, from magneticmoment data and find good agreement with experiment.Comment: 11 pages, REVTeX, TRITA-TFY-93-08 1 figure has been added (available  via conventional mail), some parts has been rewritte

Flavor symmetry breaking in quark magnetic moments