Well any material can be made into an electromagnet, but I suppose that’d be cheating.
Technically all materials are diamagnetic and most materials are paramagnetic. Which means that magnetic behaviour can be induced in them by applying an external magnetic field. That is when a magnetic field is applied it INDUCES an either supporting (para) or countering (dia) magnetic field within the material.
The hallmark of ferromagnetism is that there is a “memory” to this effect and the induced field persists even when the applied field is removed. Ferromagnetism is often the result of complicated interactions (that are actually quantum mechanical in nature) that occur within the material provided it has the right: crystal lattice symmetry, electrons per atom, electron orbital configuration, etc. Thus, to my knowledge there is no way to “force” a non-ferromagnetic material to develop this hysteresis (memory of its magnetic past) and become ferromagnetic as it’s quite a special phase of matter that only occurs when a number of different fundamental criteria are met.
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