Ferromagnetic materials, such as iron, are strongly attracted to both poles of a magnet. Paramagnetic materials, such as aluminum, are weakly attracted to both poles of a magnet. Diamagnetic materials, however, are repelled by both poles of a magnet. Water, the main component of grapes, is diamagnetic. When an electric charge moves, a magnetic field is created.
Every electron is therefore a very tiny magnet, because electrons carry charge and they spin.
Additionally, the motion of an orbital electron is an electric current, with an accompanying magnetic field. In atoms of iron, cobalt, and nickel, electrons in one atom will align with electrons in neighboring atoms, making regions called domains, with very strong magnetization. These materials are ferromagnetic, and are strongly attracted to magnetic poles. Atoms and molecules that have single, unpaired electrons are paramagnetic. Electrons in these materials orient in a magnetic field so that they will be weakly attracted to magnetic poles.