What is the difference between the magnetism of a magnet and surface magnetism?
Many people say how much is the magnetism of magnets and the surface magnetism of magnets. Specifically, what is the concept of magnetism of magnets and the surface magnetism of magnets and how to define it? What is the relationship and influence between the two?
First of all, the definition of surface magnetism: surface magnetism refers to the magnetic induction intensity on the surface of magnet. The data presented on the surface of magnet is only a data reflection of the magnet itself on the measuring tool. Because the sensation of each measuring tool is not necessarily accurate, there is no definite specification for the surface magnetism of magnet products, which is the most common. See is to enlarge the tolerance range of data, or directly according to their own product requirements, after all, data is only a considerable performance.
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Generally, Gaussian meters, also known as Tesla meters, are used to measure the magnetism of magnetometers. However, because there is no specific standard for each manufacturer's products, and because the Hall induction components on the Gauss gauge are different, and the Hall induction intensity is different, the meter magnetism measured is also different. Simply speaking, for the same product, we use the domestic Gaussian gauge to measure, if we measure it. The surface magnetism is 3000GS (GS: unit of surface magnetism) and is measured by Japanese Gaussian gauge. Because of the quality problem of Hall induction elements on the Gaussian gauge, the surface magnetism measured by Japanese Gaussian gauge is about 200 GS higher. Therefore, if a product looks at the magnetic problem of the meter, it can not judge whether the magnet product is good or bad.
And what we call magnetism is usually the property that can absorb iron, cobalt, nickel and other substances called magnetism. We can do a small experiment to verify the existence of magnetism:
1. Put the magnet in the iron chip (or pin) and take it out. The magnet can attract the iron chip (or pin).
2. Magnets are placed in iron scraps (or pins) separated by some substances (such as wood, glass). Magnets still absorb iron.
3. Place the magnet in sawdust or copper sheet (powder). Magnets cannot absorb sawdust or copper.
So from the above small experiments, we can see that magnetic strength can attract more pins. If magnetic weakness, then the pins that can be attracted will be smaller. If we measure these two magnets with a Gaussian meter, the result is that the magnetometer with more pins must have a higher magnetism. What's the problem? Of course, the stronger the magnet is, the higher the magnetic energy product will be. Simply speaking, we compare magnetism to water, just like a barrel. Full of a bucket of water, the barrel of strong magnetism weighs heavier than the barrel of weak magnetism. Why is it heavy? The only explanation is that the density of strong magnetism barrel water is higher than that of weak magnetism barrel water.
It is not difficult to see that magnetism, magnetism and surface magnetism are the terms we often talk about. Their internal relations involve many physical properties of magnets. The products of the same specification may have different magnetism because of different magnetic energy products. Here we should state that surface magnetism is not equal to magnetism.