Everyone knows that neodymium iron boron permanent magnets can attract iron. The key principle is that a magnetic field is generated around the neodymium magnet. When a ferromagnetic object approaches, magnetization occurs, generating another permanent magnet. So, what kinds of metal materials can neodymium iron boron permanent magnetic materials attract?　

In daily life, magnet stones are very common items. Many people played with magnet stones when they were children. But why have we only heard of magnets but never of aluminium or copper magnets? How exactly does the magnetism of a magnet come about?　

We have all seen magnets in our daily life. But do you know what the principle of magnets is? Let's learn about it today. Do you still remember the compass, one of the four great inventions of ancient China? And there is the maglev train. These are all applications of magnets in life　

The loss of magnetism (i.e., demagnetization) of a magnet is usually caused by the disorder of the internal microscopic magnetic domain structure. The following is a detailed analysis of the demagnetization conditions and principles from aspects such as temperature, external magnetic field, mechanical action, time and environmental factors: