Why is iron magnetic?

Today, when I took the magnet out of my pocket to play, strangely, it sucked up the coin in my pocket, and that coin sucked up another coin. Hey, can magnets transfer their adsorption capacity through metals? Why on earth?

In order to answer this wonderful question, I did the following small experiments;

Materials; Iron, metal, magnetic powder.

The experiment began. I picked up the metal adsorbed by the magnet and stuck the small metal on the edge of the metal. The scratch magnet was firmly attracted. Next, I took the magnet away, and the metal without' backing' suddenly lost its support and immediately fell off. Then, I picked up the magnet and rubbed it back and forth on the metal in the same direction. According to the book, the magnetism of this magnet will be enough to attract some small metal and magnetic things. When I picked up the magnetic metal and approached the magnetic powder, the small metal absorbed the magnetic powder. Moreover, I picked up my chopsticks and knocked on the metal a few times, and then I put the magnetic powder in. Anyway, I can't suck in the tiny magnetic powder. Why is this happening? I'm confused.

I looked up the encyclopedia and went online to find the answer.

It turns out that metals can be magnetic because there are many primitive magnets with opposite magnetic poles in some metals. When there is no external magnetic field, these primary magnets are arranged in disorder, and their magnetism cancels out each other and does not show magnetism to the outside world. When the iron is close to the magnet, these original magnets are arranged neatly under the action of the magnet, so that the end close to the magnet has the opposite polarity to the magnet and attracts each other. This shows that iron can be magnetized by magnets because of the existence of primary magnets. Metals such as copper and aluminum have no original magnet structure, so they cannot be attracted by magnets.

What is magnetism? Simply put, magnetism means that a substance will be subjected to magnetic force when placed in an uneven magnetic field. In the same inhomogeneous magnetic field, the magnetic strength of a substance is determined by the direction and strength of the magnetic force received by the substance with unit mass. Because any substance is magnetic, any substance will be affected by magnetic force in an uneven magnetic field.

The magnetism of the metal strengthened by the magnet is increased, and the magnetic force is also large, so that things can be adsorbed. When chopsticks beat metal, these original magnets will not show magnetism if they are arranged in disorder.

It took me some time to finally solve the problem. Seeing the sweat on my hands, I think that people who pursue science must be good at finding problems and finding answers through exploration and research. Today my exploration is meaningful!