The higher the number, the better the shield. Low carbon steels have a Permeability of - , while MuMetal can have values as high as , - , The saturation point is the flux density at which the material can not contain any more magnetic flux. Steel saturates around 22, Gauss, while MuMetal saturates at about 8, Gauss. In lower flux density fields, such high permeability materials provide greater attenuation.
In higher field densities, MuMetal becomes saturated, and loses its effectiveness. In these cases, steel provides good attenuation and a much higher saturation threshold. Which material is right for you depends on your specific shielding problem. For low field strength, sensitive electronics, MuMetal can provide better shielding than steel. For many applications involving large, powerful neodymium magnets, the higher saturation point of steel serves better.
In many specific cases we're asked about, a steel sheet-metal shield is often the best solution. We are now required to collect sales tax in several states. If your business is tax exempt, learn more here. Login Details. New Account. Is your business tax exempt? Send us your tax exempt form to salestax kjmagnetics. After we review and approve your submission allow business days , your orders placed online will not include sales tax when you are logged in. If tax exempt, the Company Name field above must match the name on your tax exempt certificate.
Account Info Logout. Cart 0. Your shopping cart is currently empty. The magnetic field lines are closed loops and must be continuous between a north and a south pole. In the case of a bar magnet, think of field lines exiting from the north pole, radiating through space, and re-entering the bar magnet at the south pole, continuing through the magnet back to the north pole. Since these field lines must be continuous, they must find a way back to their origin.
They cannot be stopped and have nowhere to go. The field lines can however be redirected. Therefore, it is possible to design a region of space relatively void of magnetic field lines because they have been redirected around that region. Note that you have not stopped them, just redirected them.
The field lines still must be continuous and eventually close back on themselves. In order to redirect magnetic field lines, you offer them a preferred path. Magnetic field lines prefer to travel in materials that have certain magnetic properties, namely materials with high permeability. By placing a material of high permeability or at least a permeability higher than the region in question around the region you wish to shield, you effectively offer the field lines a better path to travel.
The magnetic lines take that path and stay out of the region you wanted to shield. The high permeability material will "conduct" the magnetic field lines better than its original path. In summary, there are unique challenges when handling and controlling magnets simply because it is not possible to fully block a magnetic field. Bunting design and manufacture a wide range of magnets and magnetic assemblies.
Many are bespoke for specific applications. For further information on bespoke magnet assemblies and magnet designs for sensor of other applications, please contact us via:. Email: sales. Via the Bunting-Berkhamsted website for specialist magnets, magnetic assemblies and magnetising equipment. This website uses cookies so that we can provide you with the best user experience possible. Cookie information is stored in your browser and performs functions such as recognising you when you return to our website and helping our team to understand which sections of the website you find most interesting and useful.
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