In the course of this article we would like to tell you which are the most powerful magnets that can be obtained today in the market. Before that, however, it seems essential to make clear that the magnet is a material that has the capacity to attract iron and steel, mainly, when they are within the magnetic field of the magnet. This magnetic field is the result of the attraction of the opposite poles of magnets.
Our Company IMA deals with Neodymium magnets, but also those of Samarium, which are known as rare earth magnets and are the most modern generation of magnetic materials. They have properties well above traditional types and are currently the most powerful magnets on the market. The high coercitivity, as well as remanence, allow for new possibilities and novel designs for use in small spaces or where a higher magnetic field is needed.
The maximum working temperature is what conditions the use of these magnets. For example, those of Neodymium can be used for maximum working temperatures from 80ºC centigrade to 200ºC. Those of Samarium from 200ºC to 350ºC. Both can be used at temperatures below 0ºC.
Neodymium and magnetic resonance
The American company General Motors and the Japanese Sumimoto Metal put the first magnet, of Neodymium (Nd2Fe14B), on the market in the year 1982. These magnets soon found a space in technological industry sectors, in devices such as loudspeakers or hard drives.
However, there are other environments, where we can find much more powerful magnets in our day to day life, such as medical devices where magnetic resonance scans are made. This type of medical equipment uses a strong magnetic field for its operation. The closed resonance devices are large Neodymium magnets. On the other hand, the open ones are strong magnetic fields operating by electromagnetism . For this reason, it is important not to approach these devices with metal objects.
We must bear in mind that the Earth has a magnetic field of about 5x10-5 Tesla. The one of an open magnetic resonance apparatus up to 0.5 t closed can reach 5 Tesla.
The most powerful magnet in the world is 44.14 Tesla
Far from a day-to-day use, we can find large size magnets for scientific purposes. The most powerful magnet in the world was built in the United States in 2011 at a University Center in Florida. This super magnet has a magnetic field of 44.14 Tesla, and we can say that it is 900 thousand times that of the earth and more than 9 times greater than that of closed magnetic resonance equipment that we find in a hospital center. To visualize its power, we can indicate that more than ten thousand litres of water are needed to cool down the core. The use of this powerful magnet will allow improvements of materials with which to make products such as semiconductors or solar cells.
It is true that after turning this into the most powerful magnet that exists today, leaving behind the 38 Tesla of a Chinese laboratory, it must be said that nowadays, there are magnets with more power, but be advised that they are hybrid and non-resistive . As we know, hybrid magnets can only maintain maximum power for less than a second, while the resistive ones will do so during the entire period required.
Research with this powerful magnet will allow science to advance in the study and use of materials that will gradually become part of our daily life and which, possibly, we are not aware of, now.