Why the surface gauss cannot represent the actual performance of a magnet?

What is surface Gauss?

The surface Gauss refers to the magnetic induction intensity at a certain point on the surface of the magnet, it is measured by Gauss meter, the unit is Gauss (Gs) or Tesla T (1T=10000Gs, 1mT=10Gs). It is the most widely used measurement method due to its convenience.

How to measure the surface Gauss?

A Gauss meter is necessary to measure the surface Gauss. When place the sensor head of the Gauss meter on the magnet surface, the value will be displayed on the display screen of the Gauss meter.

It should be noted that the surface Gauss of different point of the magnet is different. Even at the two poles of the magnet, the surface Gauss values of the center point and the edge of the pole are very different. Therefore, when we describe the surface Gauss, the measuring point of the surface Gauss should be informed.

Why the surface gauss cannot represent the actual performance of a magnet?

 

  1. A Gauss meter measures the value of a point on a magnet. It’s hard to put the sensor in the same spot every time when you make a measurement, so the surface Gauss measured by Gauss meter is a rough value, not an accurate one.
  2. Gauss meters from different manufacturers have different Hall sensors, they provide different values even measuring the same magnet. In addition, the Gauss meter measurement standards vary in different countries.
  3. Many people think the remanence(Br)determines the surface Gauss of the magnet, but this is limited. The surface Gauss is affected by the material, shape, size and magnetization way of the magnet. Take Neodymium magnet grade N38 and AlNiCo magnet grade AlNiCo5 for an example who have similar remanence value(Br), we assume that the magnets of these two materials have the same shape, size, magnetization method, and we measure their surface magnetism at the same point, the surface Gauss of AlNiCo magnet may only be a fraction of that of neodymium magnet.

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