The interior of the "ferromagnetic material" such as iron has a special structure. The original ferromagnetic material is composed of countless tiny "small magnets". These small magnets can be freely rotated. Usually, their directions are disordered, the magnetic properties cancel each other, and the entire object is not magnetic.
Once they meet the magnet, the "small magnets" inside the ferromagnetic material are reordered in the same direction, and the magnetic layers are superimposed on each other, thus causing the ferromagnetic material to exhibit macroscopic magnetic properties. Only a very small number of substances in the world are ferromagnetic substances, such as iron, cobalt and nickel. The proper addition of other elements to the ferromagnetic material can make the numerous tiny "small magnets" inside it more flexible or opposite, so there are "soft magnetic" and "hard magnetic" points. The silicon steel sheet of the transformer is a low-frequency soft magnetic substance, the magnetic rod in the radio is a high-frequency soft magnetic substance, and the magnet is a hard magnetic substance.
It is determined by the characteristics of the magnet. If the atomic current is interpreted, the magnetic field generated by the current magnetizes another object. The magnetized object generates an electric field. The electric field interacts to generate a force.
Substances are mostly composed of molecules, molecules are made up of atoms, and atoms are composed of nuclei and electrons. Inside the atom, the electrons keep spinning and rotate around the nucleus. Both of these movements of electrons produce magnetism. However, in most substances, the direction of electron movement is different and disordered, and the magnetic effects cancel each other out. Therefore, most substances do not exhibit magnetism under normal conditions. The magnetic line does not exist, it is constructed by scientists for easy understanding.
The O4Fe3 component is a special internal structure of atoms such as iron, cobalt, and nickel, and the atom itself has a magnetic moment. In general, the arrangement of these mineral molecules is confusing.
Their magnetic regions interact with each other and show no magnetism, but under the guidance of external forces (such as magnetic fields), the orientation of their molecules will tend to be the same, and their magnetic properties will be clearly displayed, which is commonly known as magnets.
The magnet is divided into a permanent magnet and a soft iron. The permanent magnet is magnetized, so that the spin of the magnetic substance and the angular momentum of the electron are arranged in a fixed direction, and the soft magnetic is a current (also a method of adding a magnetic force).
Removing the soft iron will slowly lose its magnetism. The earliest discovery and use of magnets should be Chinese. The "compass" is one of the four major inventions in China. Permanent magnets can't actually be maintained forever, weakening over time. Metal bismuth 30-35%, iron about 65%, boron 1% strong magnetic