With the availability of the magnetostrictive material, Terfenol-D, in particle form a new type of composite is emerging. One or more layers of Terfenol-D layers may be embedded in conventional fiber reinforced plastic composites. Utilizing the magnetostrictive property, the Terfenol-D layers can be used to introduce actuation forces. In this paper, we present investigations on vibration suppression of simply-supported and cantilevered magnetostrictive composite beams utilizing a thin embedded magnetostrictive layer to introduce actuation stresses. A velocity feedback, constant gain control law is used considering the beam as a distributed parameter system. The magnetostrictive composites can be tailored to meet a variety of requirements with regards to their vibration suppression capability, as there are a number of variables the designer can choose, such as, lay up sequence, location and thickness of the magnetostrictive layer, span length over which the coils enclose the magnetostrictive layers, coil radius and number of turns in a coil. Numerical results are presented to bring out the effect of such parameters on vibration suppression performance.