SUMMARY. Paramagnetic colloidal particles dispersed in water and placed above the domain walls of an uniaxial ferrimagnetic garnet film, can be transported in different location of the film when subjected to external magnetic modulations. With this strategy we realized a magnetic colloidal shift register that allowed programmable, dispersion free particle motion, separation and subsequent logical operations on the complex biological libraries transported by the particles. Also, we studied the rich dynamics of particles externally driven through periodic pinning potentials that are made by array of magnetic bubble
domains. All these methods to manipulate colloidal carriers, can be used into integrated microfluidics systems, or applied in colloidal, chemical and biomolecular research.