A permanent magnet is then of a material that retains, separates and localizes temperature particles.
We have already material polarized with opposite charges at opposing ends. This is a charge magnet.
We can then have material that retains, separates and localizes gravity particles. They would then be gravity magnets.
Hey! This is my dream.
Why not gravity magnet in the first place? Because \(B\) field is produced by a flow of electrons. A flow of electrons also generates heat. The rest is speculative.