The quality will become bigger. There are many tiny "magnets" in the magnets (atomic molecular electron moments) that exhibit macroscopic magnetic fields in one direction. These small magnets are in the magnetic field of other small magnets, and there will be energy of interaction, E = mc2, which will provide a top quality, but extremely small. All small magnets have the lowest energy in one direction, which is why the magnets are magnetic because they tend to lower their energy, but they are highly ordered in one direction, entropy (S) is small, and entropy tends to increase. The result of the final compromise is that the free energy F=E-TS is the smallest. Therefore, if the magnetism is simply demagnetized, the quality is increased.
In fact, Einstein's energy equation is very clear, quality is energy. The material we usually see, the energy/mass is roughly composed of the following parts:
The energy/mass produced by the coupling of matter and Higgs field.
2. Energy/quality caused by strong interactions.
3. Energy/mass caused by other (electromagnetic and weak) interactions. Then explain in turn.
Higgs particles, the so-called God particles, are certainly no strangers. It is the Higgs mechanism, that is, the energy coupled by matter and the Higgs field gives the basic particle mass, such as the quality of the quark. But we can find that the mass of proton neutrons is much larger than the quark mass that makes them. In fact, the energy of quark kinetic energy and strong interaction should be added. First, the quark in the proton neutrons moves at a speed close to the speed of light, and the kinetic energy is large, and then the energy of the strong interaction (here humans do not fully understand how to calculate, related to color confinement and vacuum phase transition,
a phenomenological The model has a higher vacuum energy in the area of the color confinement). It is worth mentioning that 80% of my 50kg body weight is given by strong interaction, that is, the force between the quarks gives me weight. The remaining 10% of the weight is given by the Higgs field. Then the last part is the contribution of electromagnetic and weak interactions. The mass/energy of a magnet here is also contributed by the above three parts. Corresponding to the electromagnetic part, the mass/energy is increased after demagnetization.
It is worth mentioning that always remember that quality and energy are the same thing, there is no difference, such as energy, energy is quality. The state of the actual magnet is determined by the energy as low as possible and the entropy as high as possible. The related theory of thermodynamics can well describe and calculate various situations and processes. Under certain temperature and volume, the free energy is the lowest. What is the "small magnet" in the end: The magnetic moment generated by the orbital angular momentum of electrons is classically said to generate magnetic moments around the nucleus. Of course, the classic image is wrong just to help understand
1. Electron spin angular momentum The magnetic moment produced is classically the magnetic moment generated by electron rotation.
2. The nuclear magnetic moment is a magnetic moment generated by the spin of a positively charged core. It is actually the orbital angular momentum and spin angle of protons constituting the nucleus. The magnetic moment generated by the momentum, the neutron has no spin magnetic moment, I don't know. Compared with the former two, the nuclear magnetic moment is much smaller than the magnetic moment caused by the orbital angular momentum of the electron and the spin angular momentum.
The minimum energy is the same when the magnetic moments are in the same direction: this is obvious in classical electromagnetism. The question is why an atom will show a magnetic moment. One of the effective mechanisms is that when the electron spin directions are the same, the spatial wave function exchange antisymmetry has effective repulsion, so that the electrostatic potential energy is smaller (such as the singlet and multiple states of the helium atom).
The total wave function of the Fermion is exchange-antisymmetric, the total wave function is equal to the spatial wave function multiplied by the spin wave function, the spin wave function is exchanged symmetrically, the spatial wave function is exchanged against the scale, and the spin wave function is exchanged for the antisymmetric space wave function exchange. Symmetrical, the spin wave functions are exchange symmetric when the two electron spins are the same, so the spatial wave functions are exchanged against each other, so they are farther apart from each other.