Applications of Rare Earth MagnetsĪt Adams Magnetic Products, we offer a broad selection of rare earth magnets, including nickel-plated neodymium disc, block, ring magnets, samarium cobalt block, ring, and disc magnets. This effect can be studied by looking at its demagnetization curve, which provides information about the magnetic characteristics, including how strong its magnetic field is and how resistant it is to demagnetization.Ĭlick to view the demagnetization curves for our rare earth magnet products. A magnet can be partially demagnetized by applying a reverse magnetic field on it. When the bulk of the material reaches this temperature, it shows virtually no net magnetization. At this point, the thermal agitations within the material apply more force than the resistance to movement provided by the magnetic domains. All magnetic materials have a temperature limit known as the Curie Temperature. The two primary ways a permanent magnet can be demagnetized are by:
Certain conditions can cause some domains to fall out of alignment, triggering the magnet to lose some or all of its magnetic field. Permanent magnets that are fully magnetized have magnetic domains that are aligned in a specific way. Many factors influence how a rare earth magnet will perform within a magnetic circuit, such as its permeance coefficient and operating environment. We offer the following types of samarium cobalt magnets:ĭemagnetization Curves for Our Rare Earth Magnet Products However, compared to neodymium iron boron, samarium cobalt offers greater corrosion resistance and thermal stability, making it better suited for applications involving corrosive chemicals or extreme temperatures.
The two materials share many attributes, including High Br, high Hc, relatively high BHmax (approximately 18–33 MGOe), high resistance to demagnetization, low machinability, and suitability for multiple pole magnetization given the proper magnetizing fixture is available. Like neodymium iron boron, samarium cobalt is a rare earth material available in both sintered and bonded forms. TabMAG® neodymium magnets with adhesive.We offer the following types of neodymium magnets: However, they are only suitable for certain applications because of their sensitivity to high temperatures and susceptibility to oxidation. In many cases, neodymium magnets are a less brittle and more economical alternative to samarium cobalt magnets. Suitability for magnetization in any direction (given the proper alignment) and multiple pole magnetization ( provided the proper magnetizing fixture is available).Low machinability (no conventional drilling, turning, milling).Available in both sintered and bonded forms, this class of rare earth material possesses the highest Br, high BHmax (approximately 10–53 MGOe), and relatively high Hc. Types of Rare Earth Magnets From Adams Magnetic Products Neodymium MagnetsĪmong commercial magnet materials, the rare earth magnets made from neodymium iron boron are the most powerful in the marketplace. Below, we highlight the rare earth magnet products we offer and outline some of their typical applications. This extensive experience provides us with the knowledge and skills needed to deliver magnet solutions for nearly any customer application. This quality has led to them replacing alnico and ferrite magnets in many applications, including head actuators for computer hard disks, magnetic resonance imaging (MRI) systems, loudspeakers and headphones, motors, and more.Īt Adams Magnetic Products, we’ve engineered and manufactured magnetic products for over 70 years. They are currently the strongest type of permanent magnets, producing significantly stronger magnetic fields than other types of magnets like ceramic or alnico magnets. Rare earth magnets are magnets made from alloys of rare earth elements, including neodymium iron boron or samarium cobalt.
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