Magnetic microsphres are one of the most promising complex materials, which are often composed of Fe_3O_4 core and polymers shell. These kinds of particles are not magnetic, but also with properties like small particle size, high couple capacity, fast movement and long-time suspension etc, which make it an important tool in both biology research and other fields. In this paper, amino-group modified magnetic microsphres were prepared and well characterized. The as-synthesized particles were used fo...