  The scaling of the thermoremanent magnetization and of the dissipative part
of the non-equilibrium magnetic susceptibility is analysed as a function of the
waiting-time $s$ for a simple ferromagnet undergoing phase-ordering kinetics
after a quench into the ferromagnetically ordered phase. Their scaling forms
describe the cross-over between two power-law regimes governed by the
non-equilibrium exponents $a$ and $\lambda_R/z$, respectively. A relation
between $a$, the dynamical exponent $z$ and the equilibrium exponent $\eta$ is
derived from scaling arguments. Explicit tests in the Glauber-Ising model and
the kinetic spherical model are presented.
