  Magnetic moments of baryons in the ground-state octet and decuplet are
calculated in a light-front framework. We investigate the effects of quark mass
variation both in the current operator and in the wavefunctions. A simple fit
uses single oscillator wavefunctions for the baryons and allows the three
flavors of quark to have nonzero anomalous magnetic moments. We find a good fit
to the data without allowing for strange quark contributions to the nucleon
moments. A slightly better fit is obtained by allowing for explicit SU(3)_f
breaking in the wavefunctions through a simple mechanism. The predictions for
magnetic moments in our relativistic model are also much less sensitive to the
values chosen for the constituent quark masses than those of nonrelativistic
models. Relativistic effects can be of order 20% in general, and can alter
familiar relationships between the moments based on SU(3)_f and a
nonrelativistic treatment of spin.
