We investigate the effects of the magnetic dipole-dipole coupling and the<br />
electromagnetic radiation on the frequency evolution of gravitational waves<br />
from inspiralling binary neutron stars with magnetic dipole moments. This study<br />
is motivated by the discovery of the superstrongly magnetized neutron stars,<br />
i.e., magnetar. We derive the contributions of the magnetic fields to the<br />
accumulated cycles in gravitational waves as $N_{mag} \sim 6 \times 10^{-3}<br />
(H/10^{16}{\rm G})^{2}$, where $H$ denotes the strength of the polar magnetic<br />
fields of each neutron star in the binary system. It is found ...