What makes neodymium magnets so strong

Gauss, Tesla and N45: About the strength of magnets

Magnets are unfortunately not equal Magnets. Especially in hers There are differences in strength like day and night: some can be blown away by the slightest breeze, others have to be dragged away from the ground again with the greatest effort. Why is that? And how do i know what magnet for what purpose do I have to use it?

Messrs. Gauss and Tesla

It is natural no little men called Gauss and Tesla in the magnets, which are responsible for the magnet holding less or better. However, the two have Scientist Johann Carl Friedrich Gauss (1777-1855) and Nikola Tesla (1856-1943) with the so-called magnetic flux density employed. Put simply, this describes the directed force of a magnetic surface on the adhesive body. In honor of the two researchers, the Units of measurement according to them named. However, Gauss (G) is no longer an official unit, Tesla (T) is that internationally recognized measure. Nevertheless, one still uses Gauss from time to time. The following applies: 1T = 10,000G

Why are magnets different in strength?

Magnets have a whole different adhesive force. In general, the greatest attraction the magnets on hers Poland is to be found. In the middle of the magnet, however, the field is rather weak.

Which other factors influence the strength

  • The distance: The strength of a magnet is strongest directly on the surface. The more space there is between the magnet and the object, the weaker the attraction becomes.
  • The surface: When the surface of the adhesive body smooth the strength of the magnet increases enormously. Conversely, a rough surface is bad for strength.
  • The direction: A magnet works best when it is direct perpendicular to the adhesive body.
  • The strenght: The volume of the magnet is important to its strength, as is its Ratio of thickness to length. The same applies to the adhesive body: If it is too thin, its magnetic saturation is reached too quickly and part of the magnetic field remains unused.
  • The material: Certain materials are stronger magnetic than others - this includes rare earths. But the material of the adhesive body also influences the force of attraction of the magnet on it. An adhesive body made of soft iron is particularly attractive.

What do N35, N42 and N45 mean?

On the one hand, the names of the magnets give you the information Power of a magnet (the numbers) and on the other hand the maximum temperatureup to which it can be used (the letters).

Most often you come across the combination N and a number. The letter N says that the magnet can only be used up to 80 ° C. Other options are M, H, SH, EH and UH. They indicate the maximum operating temperature of 100, 120, 150, 180 or 200 ° C. A Overview can be found here.

The numbers become the Magnetic energy per volume specified. The lowest value for N magnets is 35, the highest 52. However, the strongest magnet N52 can actually only be used up to a maximum of 65 ° C. The combination of numbers and letters is called Unit of measure for the quality the magnets used.