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What are Rare Earth Magnets?

Rare earth magnets, also known as neodymium magnets or samarium cobalt magnets are magnets made from alloys of rare earth elements.  They are currently the strongest type of permanent magnets made, and produce significantly stronger magnetic fields than other types such as ceramic or alnico magnets.  Rare earth magnets have replaced alnico and ferrite magnets in many applications, including head actuators for computer hard disks, magnetic resonance imaging (MRI),loudspeakers and headphones, several types of motors, and more.

Neodymium Magnets

Among commercial magnet materials, the rare earth Neodymium Iron Boron magnet is the most powerful in the marketplace. Available in both sintered and bonded forms, this class of Rare Earth material possesses the highest Br, relatively high Hc and high BHmax. In many cases it is a more economical alternative to Samarium Cobalt, but is only suitable for certain applications because of its temperature sensitivity and susceptibility to oxidation. Neodymium has an approximate energy product range of 10-53 MGOe.  Read more about Neo Magnets.

Samarium Cobalt Magnets

Like Neodymium Iron Boron, Samarium Cobalt is a class of rare earth material that is available in both sintered and bonded forms. The two materials share many of the same attributes, such as High Br, high Hc and relatively high BHmax. However, Samarium Cobalt is more resistant to corrosion than Neodymium iron boron. Samarium Cobalt has an approximate energy product range of 18-33 MGOe, and exhibits better temperature stability than Neodymium.  Learn more about SmCo Magnets.

Rare Earth Magnets Stock Selection
Adams offers a wide selection of Rare Earth magnet products. Click on your desired product type for stock product specifications.
View a small sampling of our stock Neodymium disc magnets in several grades.
Adams offers Neodymium magnets in square and rectangular blocks.
We stock NdFe ring magnets, magnetized through the thickness.
View our stock SmCo disc magnets, in grades 18-26.
Our SmCo block magnets offer good thermal stability!
View our stock Neodymium magnets with adhesive, great for closures.

Demagnetization Curves

A second quadrant demagnetization curve provides information about the magnetic characteristics of a magnet, including the magnetic field strength and how resistant it is to demagnetize. How it is used in a magnetic circuit will affect its performance. When a permanent magnet is fully magnetized, its magnetic domains are aligned. Certain conditions such as temperature and reverse magnetic fields can cause some of the domains to lose this alignment and reverse, triggering the magnet to lose some or all of its magnetic field.  Click to view our demagnetization curves.

Military and Defense Materials

Adams Magnetic Products has the knowledge, understanding and systems in place to fully comply with the Arms Export Control Act (AECA) and International Traffic in Arms Regulations (ITAR). We are your partner in fabricating magnets and magnetic products for the defense and military industries. As an ITAR registered supplier, you can rest assured your data and confidential information is safe with us. We are also your source for Defense Acquisition Regulations System (DFARS) compliant materials. Let our technical staff assist you in obtaining the right materials for your DoD needs.

Gluing Magnets

Several factors must be considered to assure the effective performance of the magnet, the adhesive and the resulting bond. These include the chemical and physical properties of the magnets and the surfaces to which they are affixed. Detailed coverage of all these factors, along with some adhesives to try, is covered in our white paper Gluing Magnets.

Why Choose Adams?

Our technical experts are ready to answer your questions and address your magnetic needs. Whether it’s selecting a magnet to fit an application, choosing the most cost effective material or reviewing options from what is available in the market, we are here to help with:

  • Application and Design Engineering Assistance
  • Testing/Analysis of Magnetic Materials
  • Magnetic Circuit Analysis/FEA
  • Value Analysis/Value Engineering Support
  • Inventory Management Programs

A Commitment to Value

We define value as having the right products available at the right time and delivering them as promised, defect-free, at competitive prices. Adams is committed to delivering outstanding value to customers at every opportunity.

Certified Quality Management

Adams maintains ISO 9001:2008 certification, reinforcing our strong operational processes and commitment to continual improvement. We have a standard of zero defects in everything we do.

Resources

  • Adams 2016 Hard Magnet Materials Catalog
    (7MB) Featuring a magnet materials overview, chart of materials properties and demagnetization curves for Neodymium, Samarium Cobalt, Ceramic (Ferrite) and Alnico materials offered by Adams.
  • Chart of Material Properties
    Displays each permanent magnet material along with its Maximum Energy Product: Bhmax, Residual Flux Density: Br Gauss, Coercive Force: Hc Oersteds, Intrinsic Coercive Force: Hci Oersteds and Maximum Operating Temperature: C / F.
  • Breakaway Force of a Magnet
    Explains the test methods used to determine how much force it takes to pull a magnet directly away from the surface it is attached to.
  • Samarium Cobalt Product Specifications
  • Adams TabMAG® Neodymium with Adhesive Product Specifications
    Adams offers TabMAG® Neodymium discs and rectangles with adhesive on one side. They are commonly used in packaging, box closure, display, and door latch applications. This PDF gives an overview of our most popular TabMAG® magnets.