Magnet Details

A magnet is an object that attracts iron and generates a magnetic field outside it. Magnets in the narrow sense refer to products made of magnetite ore, and magnets in the broad sense refer to objects or devices that are used to generate a magnetic field. Magnets act as magnetic dipoles that attract ferromagnetic substances such as metals such as iron, nickel, and cobalt. [1] The determination of the magnetic pole is to hang a magnet with a thin wire. The magnetic pole pointing to the north is called the north pole or N pole, and the magnetic pole pointing to the south is called the guide pole or S pole. (If the earth is thought of as a large magnet, then the earth's magnetic north pole is the S pole, and the geomagnetic south pole is the N pole.) Magnets with different poles attract each other, while the same poles repel. The guide pole and the finger north pole attract each other, the guide pole and the guide pole repel each other, and the finger north pole and the finger north pole repel each other.
Magnets are divided into permanent magnets and non-permanent magnets. Natural permanent magnets are also called natural magnets, and permanent magnets can also be manufactured artificially (the strongest magnet is a neodymium magnet). Non-permanent magnets are only magnetic under certain conditions, usually in the form of electromagnets, which use electric current to strengthen their magnetic fields.
The scientific name of magnet is magnet, and magnet is a kind of magnet.
The magnet is made by pressing ferric oxide powder with filler and binder. Some magnetites have strong magnetism and contain more Fe3O4, while others have weak magnetism and contain less Fe3O4. Matter is mostly composed of molecules, molecules are composed of atoms, and atoms are composed of nuclei and electrons. Inside an atom, electrons are constantly spinning on their own and orbiting the nucleus. Both of these movements of electrons create magnetism. But in most substances, the electrons move in different directions and are chaotic, and the magnetic effects cancel each other out. Therefore, most substances are not magnetic under normal conditions.
Ferromagnetic substances such as iron, cobalt, nickel, or ferrite are different. The electron spins inside it can be spontaneously arranged in a small range to form a spontaneous magnetization region, which is called a magnetic domain. After the ferromagnetic material is magnetized, the internal magnetic domains are arranged neatly and in the same direction, which strengthens the magnetism and constitutes a magnet. The iron-absorbing process of the magnet is the magnetization process of the iron block. The magnetized iron block and the different polarities of the magnet generate attractive force, and the iron block is firmly "sticked" to the magnet. We say that the magnet is magnetic.