Why can magnets attract iron?

The characteristics of magnets, if explained by atomic current, are that the magnetic field generated by the current magnetizes other objects, and the magnetized objects generate electric fields, and the electric fields interact to generate forces.

Most substances are made up of molecules, molecules are made up of atoms, and atoms are made up of nuclei and electrons. Inside the atom, electrons keep spinning around the nucleus. Both of these movements of electrons will produce magnetism. But in most substances, the direction of electron movement is different and chaotic, and the magnetic effects cancel each other out. So most substances are nonmagnetic under normal circumstances.

Ferromagnetic substances such as iron, cobalt, nickel or ferrite are different, and their internal electron spins can be arranged spontaneously in a small range to form spontaneous magnetization regions, which are called magnetic domains. After the ferromagnetic substance is magnetized, the internal magnetic domains are arranged neatly and in the same direction, so that the magnetism is enhanced and a magnet is formed. The process of magnet absorbing iron is the process of iron block magnetization. Magnetized iron blocks and magnets have attraction between different polarities, and the iron blocks and magnets are firmly "stuck" together. Suppose the magnet is magnetic. (Excerpted from "100,000 Why")

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