Individually addressable micro-electromagnetic unit array chips

A method for directing reactions between ligand molecules and target molecules, comprising the steps of:

• providing a unit having a plurality of individually addressable micro-electromagneticcores;
• forming a functional layer for immobilizing ligand molecules above said cores;
• providing modified ligand molecules capable of being positioned by magnetic fields;
• disposing a solution containing said modified ligand molecules on said functional layer;
• creating a pattern of immobilized ligand molecules by selectively energizing said cores to form magnetic fields which position said modified ligand molecules at predetermined locations where said ligand molecules become immobilized on said functional layer;
• providing modified target molecules able to be positioned by magnetic fields;
• disposing a solution containing said modified target molecules on said pattern of immobilized ligand molecules;
• and
• selectively energizing said cores to form magnetic fields which position said modified target molecules in juxtaposition to predetermined immobilized ligand molecules thereby directing a reaction between said target molecules and said ligand molecules.