What is the difference between the magnetism of a magnet and its surface magnetism?
Many people say that the magnetism of a magnet and the surface magnetism of a magnet. Specifically, what is the concept of the magnetism of a magnet and the surface magnetism of a magnet, and how is it defined? What are the relations and influences between the two?
First of all, the definition of surface magnetism: surface magnetism refers to the magnetic induction intensity of the magnet surface, and the table data presented by the magnet surface is only a data reflection of the magnet itself to the measuring tool. Because the induction of each measuring tool is not necessarily accurate, there is no definite specification for the surface magnetism of magnet products. The most common problem is to enlarge the tolerance range of the data, or Direct according to their own products to request, after all, data is only a considerable performance.
Generally, Gauss meter is used to measure magnetic field of magnet meter, also called Tesla meter. However, because each manufacturer produces no specific standard, and because the hall induction elements on Gauss meter are different, the hall induction intensity is different, and the measured surface magnetism is different. In the simplest sense, we use the Gauss meter made in China to measure the same product. If the measured apparent magnetic strength is 3000gs, we replace it with the one of the three thousand GS (GS: surface magnetic unit) If the Japanese Gauss meter comes to measure, because of the quality problem of hall induction element on the Gauss meter, the surface magnetism measured by the Japanese Gauss meter is about 200gs. So, if a product looks at the magnetic problem, it can not judge whether the magnet product is good or bad.
And what we call magnetism is generally referred to as magnetism, which can absorb iron, cobalt, nickel and other substances. We can do a small experiment to verify the existence of magnetism.
- 1. Put the magnet in the scrap (or pin) and take it out, which attracts the scrap (or pin).
- 2. Magnet is placed in iron chips (or pins) by some substances (such as wood board and glass), and magnet still has iron absorption.
- 3. Place the magnet in wood chips or copper chips (powder). Magnets cannot suck up wood chips or copper pieces.
So from the above small experiments, we can see that the magnetic strength can absorb more big needles. If the magnetic force is weak, the needle caused by the suction will be small. If we measure these two magnets with Gauss meter, the result is that the surface magnetism of the magnet with more big pins is higher. What is the problem? Of course, the stronger the magnetic field, the higher the magnetic energy accumulation. For example, we compare magnetism to water, just like a bucket, and also fill a bucket of water. The weight of the magnetic strong bucket water The only explanation for the weight of the bucket is that the density of the water in the bucket with strong magnetism is higher than that in the weak magnetic bucket.
It is not difficult to see that magnetic, magnetic and surface magnetic, which are the professional terms we often speak of, relate to many physical properties of magnets. For a product of the same specification, it may be different in magnetism due to the difference of magnetic energy product. Here, it is necessary to state that surface magnetism is not equal to magnetism.