LAUSR

We study rigidly rotating and pulsating (m , n ) strings in with mixed three form flux. The background with mixed three form flux is obtained in the near horizon limit of SL(2, Z )-transformed solution, corresponding to the bound state of NS5-branes and fundamental strings. We study the probe (m , n )-string in this background by solving the manifest SL(2, Z )-covariant form of the action. We find the dyonic giant magnon and single spike solutions corresponding to the equations of motion of a probe string in this background and find various relationships among the conserved charges. We further study a class of pulsating (m , n ) string in with mixed three form flux.