I want to create a cloud of magnetic particles that will levitate in an electromagnetic field with an electromagnet. Is that possible? Is it easy to do or has it been done? I already have the magnetic nanoparticles and I just want to levitate them to form a 'cloud' so that each particle will stand in the air at specific distance from the others. They have the same size/weight. Would that be a problem? They need to sit in the air with specific distance between each other. Any ideas? Thanks!