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MAGNETIC MATERIALS

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  • SM Magnetics
    2000 McCain Pkwy
    Pelham, AL 35124

    205.621.8841

    Our Online Retail Division, SuperMagnetMan
Our company-owned, ISO-certified manufacturing facilities manufacture, fabricate, and control the magnetic material production process in-house. We manufacture and control all stages in making a finished magnet, including Neodymium (NdFeB), Samarium Cobalt (SmCo), Alnico, Bonded, and Injection Molded materials. Our long history of making magnetic materials is evident in the quality of materials used in today’s most innovative products.
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Magnetic Materials

This unique structure in the magnetics industry allows our customers to rely on us for magnetic materials, magnetic components, non-magnetic components, and process control from prototype to production. Selection of the correct magnetic material is critical for any application. Below is an overview of each magnetic material that we manufacture and supply to our customers, each with specific advantages and disadvantages. 

Advantages

      • Strongest permanent magnet available
      • High Induction (Br), up to 55 MGOe
      • Its coercivity (Hci) (the ability to withstand demagnetizing forces) is good, up to 200C
      • Can be made without a mold
      • Shape & size are fabricated from a starting block
      • When the material grade is correctly selected, can last indefinitely
      • Manufactured in a wide array of material grades
      • Can reduce the overall size / weight of assemblies
      • Can reduce the overall cost of assemblies, especially motors
      • Currently used in applications for almost every industry
Disadvantages
      • At larger sizes, over 0.500”, must be handled safely and cautiously
      • Can be more expensive at the higher coercivity (Hci) grades
      • Must be coated to avoid oxidation
      • For applications over 200C, may demagnetize. NOTE: Demagnetization of magnetic materials is caused by many variables, including size, shape, application, surrounding materials, etc
    Summary

     Advantages

        • Strong inductance (Br), up to 34 MGOe
        • Can be made without a mold.
        • Shape & size are fabricated from a starting block
        • No coating is required and it will not oxidize
        • Has the best coercivity (Hci)
        • Great for applications up to 350C
        • Tremendous for applications that have high temperature requirements, i.e. aerospace and high temperature motor and sensor applications
    Disadvantages
        • Brittle. Can easily chip or break if handled incorrectly
        • Expensive. Cobalt is the main rare earth driving price
    Summary

      Advantages

        • Able to handle higher temperature in a well-designed circuit that includes magnets & steel
        • Manufacturing process allows for fields to be shaped within the magnet
        • Does not need coating
    Disadvantages
        • Tough to machine
        • Made with molds
        • Easy to demagnetize outside of steel / magnet circuit
        • Should be magnetized in its finally assembly to avoid demagnetization when assembling
    Summary

    Ferrite / Ceramic

    Advantages

        • Widely used in low cost motors
        • Does not need to be coated, will not oxidize
        • Great for applications that will not exceed 180C
    Disadvantages
        • Needs molds and/or tooling to manufacture
        • Beneficial for applications that have high volume to recoup the mold and/or tooling costs
        • Very brittle. Can easily crack or chip
    Summary

    Bonded & Injection Molded Magnets

    Advantages
        • Can be made in unique shapes due to mold requirements
        • No, or very limited, machining needed
        • Does not need to be coated
        • Very consistent magnetically and dimensionally
        • Good for applications that require a low magnetic field
        • Rated for temperatures between 80C to 220C
    Disadvantages
        • Requires tooling and mold costs
        • Piece price will be low only in high volume
        • Low magnetic properties
    Summary
      Interested in SM Magnetics partnering with you on your next product? Or, do you need to redesign and rework an existing magnetic product? Contact us to discuss your requirements.

       

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