Shopping cards and cell phones are together. Are they still available?
When the magnetic material is affected by the external energy, such as heating and impact, the magnetic distance of each domain will become inconsistent, and the magnetism will decrease or disappear. This process is called demagnetization.
The so-called magnetization is to make the magnetic domain of the magnetic domain in the magnetic material become consistent. When the material that does not exhibit magnetism is placed into another strong magnetic field, it is magnetized, but not all materials can be magnetized, and only a few metals and metal compounds can be magnetized.
The radiation of the phone will cause every tiny magnetic field in the magnetic card to be arranged in a mess, and eventually degaussing, and occasionally one or two times the room does not matter.Magnetic materials are divided into many tiny regions, each of which is called a magnetic domain, each of which has its own magnetic distance (i.e., a tiny magnetic field). Generally, the magnetic distances of each domain are different, and the magnetic fields cancel each other, so the whole material is not magnetic. When the direction of each domain is uniform, the whole material shows magnetism.
