Why are there only magnets, but not aluminum or copper magnets? what do you think?

This is actually related to the source of magnetism.

The electromagnetic theory of electricity and magnetism tells us that electricity and magnetism are like two sides of matter. An alternating electric field generates a magnetic field, and an alternating magnetic field generates an electric field. Since you want to know the source of the magnetic field, you can consider it from the electrical point of view.

Current can be regarded as the movement of charge. We know that electricity can produce a magnetic field, but for natural magnets, it is uncharged, but it is still magnetic. This will go deep into the atoms that make up the magnet for analysis. As we know, atoms are composed of electrons inside and outside the nucleus. Electrons are subatomic particles with negative charges, and the motion around the nucleus never stops. In this model, negatively charged electrons keep moving, and the movement of charge is not current? Therefore, the movement of electrons around the nucleus produces the corresponding orbital magnetic moment, and the electrons also spin when they move around the nucleus, so they also have their own spin magnetic moment.

Of course, this model is not accurate, because real electrons appear around the nucleus with a certain probability, and electrons have quantum characteristics, so the orbital magnetic moment and spin magnetic moment of electrons are quantized.

Similarly, the nucleus is a positively charged particle. Modern science believes that protons, neutrons and their nuclei all have spin phenomena, so they all have spin magnetic moments, so the magnetism shown by the whole atom is the result of the superposition of the basic particles in it. In a word, the magnetism of the substance composed of atoms also obeys this law. So in theory, any object is magnetic, but its strength is different. Why is the strength different? In fact, it is the expression of the magnetic superposition effect of particles that make up matter.

Let's talk about why magnets don't absorb copper and aluminum. In life, we find that if a magnet is attached to iron, then iron will be magnetic and can continue to attach other iron blocks, which shows that iron is magnetized, but copper and aluminum can't.

Magnetization can be regarded as a process in which the magnetic neutrality of an object is broken. Under the action of external magnetic field, the disordered magnetic moment orientation in the object is paramagnetic as a whole. The reason of paramagnetism can be thought to be that the particles that make up the object have irreducible particle magnetic moments. In addition to paramagnetism, there is diamagnetism, which can be understood by combining Lenz's law. We put Lenz's law into the microscopic world, and the magnetic flux generated by the movement of electrons must be in the opposite direction to the external magnetic field, which plays a hindrance role, so any object has diamagnetism. When an object is paramagnetic, its diamagnetic effect will be covered up. Moreover, because of the different magnetic susceptibility, even if some substances show paramagnetism, it is difficult to judge the adsorption effect simply by human feeling. In this problem, copper is diamagnetic, so it cannot be magnetized and adsorbed by magnets. Although aluminum is paramagnetic, its magnetic susceptibility is so low that it is difficult for us to detect it.

Conclusion In this problem, copper is diamagnetic, so it cannot be magnetized and adsorbed by magnets. Although aluminum is paramagnetic, its magnetic susceptibility is so low that it is difficult for us to detect it.