Eliminate the magnetism of magnets (including powerful magnets) by baking them on the fire for a few minutes and losing their magnetism after cooling.
The reason is that the magnet is magnetic because the iron atoms in the magnet are regularly arranged. After it is heated, the original arrangement of iron atoms is messed up, so it loses its original magnetism. Introduction to

Magnets: The composition of
magnets is iron, cobalt, nickel and other atoms. The internal structure of their atoms is quite special and they have magnetic moments.
types of magnets:
1, shape magnets: square magnets, tile magnets, special-shaped magnets, cylindrical magnets, ring magnets, disc magnets, magnetic rod magnets, magnetic frame magnets;
2, attribute magnets: samarium cobalt magnets, neodymium iron boron magnets, ferrite magnets, alnico magnets, iron chromium cobalt magnets;
3, industry magnets: magnetic components, motor magnets, rubber magnets, strong magnets, plastic magnets and so on.
magnets are divided into permanent magnets and soft magnetic magnets. Permanent magnets are added with strong magnetism, so that the spin of magnetic substances and the angular momentum of electrons are arranged in a fixed direction, while soft magnetic magnets are added with electricity. (It is also a method of adding magnetic force) such as the current to remove the soft iron will slowly lose its magnetism. The
magnet can generate a magnetic field and has a characteristic of attracting ferromagnetic substances such as iron, nickel, cobalt and other metals.
Hang the midpoint of the bar magnet with a thin wire. When it is stationary, its two ends will point to the south and north of the earth respectively. The end pointing to the north is called the north pole or N pole, and the end pointing to the south is called the south pole or S pole.
If you think of the earth as a large magnet, the geomagnetic north pole of the earth refers to the south pole, and the geomagnetic south pole refers to the north pole. Between magnets, the magnetic poles of the same name repel and the magnetic poles of different names attract. So, the compass repels the South Pole, the compass repels the North Pole, and the compass attracts the North Pole.