Rather than a 'sucking' type magnet I am after a 'pushing' type (i know that isn't the right terminology).
I think you need to do a little research...

A magnet will only repel a like pole of another magnet i.e. a north pole will repel a north pole. Unfortunately, magnets always have two poles; There are no magnetic monopoles in nature.
A magnetic field will normally only strongly attract ferromagnetic materials e.g. Iron, Nickel and their compounds.
There are a couple of odd exceptions:
One is the special state of Super-conductivity. In a super-conductor, the electric currents induced by the external magnetic field will produce an opposing magnetic field, so producing an opposing force between the magnet and superconductor.
The other is a weak force called Diamagnetism. Some materials (e.g. water) can produce a weak opposing field in the presence of a strong magnetic field (enabling a crazy scientist to float a tiny frog in a bead of water, placed between the poles of a very strong magnet see -
http://en.wikipedia.org/wiki/Diamagnetism)
In effect this means your electro-magnet will always attract your beaded material.
Bill
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Another approach to 'floating' on a magnetic field is to use an AC field to induce a field in a non-magnetic conductor
For instance you can use an AC electro-magnet to lift an aluminium sheet. The problem here is the induced current in the aluminium will heat it considerably, and the force of the field drops with the square of the distance.