  We present the interior solutions of distributions of magnetised fluid inside
a sphere in $f(R,T)$ gravity. The magnetised sphere is embedded in an exterior
Reissner-Nordstr\"{o}m metric. We assume that all physical quantities are in
static equilibrium. The perfect fluid matter is studied under a particular form
of the Lagrangian density $f(R,T)$. The magnetic field profile in modified
gravity is calculated. Observational data of neutron stars are used to plot
suitable models of magnetised compact objects. We reveal the effect of $f(R,T)$
gravity on the magnetic field profile, with application to neutron stars,
especially highly magnetized neutron stars found in X-ray pulsar systems.
Finally the effective potential $V_{\rm eff}$ and innermost stable circular
orbits, arising out of motion of a test particle of negligible mass influenced
by attraction or repulsion from the massive center, are discussed.
