Photo-Induced Precession of Magnetization in (Ga,Mn)As Microbars

Photo-induced precession of magnetization in (Ga,Mn) As microbars has been studied experimentally. It has been found that effective magnetic fields decrease to great extent in the microbars. The damping appears not to be affected severely, at least within the limit of microbars of micrometer size. Our findings indicate that magnetization dynamics can be controlled to some extent by patterning strained epilayers into microstructures.