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    AI Overview

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    AI Overview
    Low-coercivity cores for precision magnetic amplifiers (mag-amps) are made from amorphous alloys and nanocrystalline materials that offer high permeability and low core losses, enabling tight voltage regulation in high-frequency power supplies . These materials, such as cobalt-based amorphous alloys and nanocrystalline cores , have thin, non-crystalline structures that allow for rapid magnetic flux changes, high efficiency, and stable output voltage under varying load conditions, making them ideal for information processing equipment and high-current applications.
    Key Characteristics of Low-Coercivity Cores
    • Low Coercive Force:
      This property is essential for mag-amps, allowing for easy and energy-efficient changes in the core's magnetic state, which is critical for precise regulation.
    • High Permeability:
      A high permeability means the core's magnetic flux can change quickly and significantly, which enables precise inductance control and stable voltage regulation.
    • Low Core Loss:
      Amorphous and nanocrystalline materials exhibit low core losses at high frequencies, reducing heat generation and improving the overall efficiency of the power supply.
    • High Squareness:
      A high squareness (rectangularity of the B-H loop) indicates that the core can be easily saturated and desaturated, a key feature for mag-amp operation.
    • Fast Magnetic Saturation:
      The ability to saturate and desaturate quickly allows for rapid response to transient current changes, protecting the switching circuitry.
    Common Core Materials
    • Cobalt-Based Amorphous Alloys :
      Opens in new tab
      Materials like Metglas® 2714A offer an excellent combination of high permeability, low coercive force, high efficiency, and operation at high frequencies, making them a top choice for precision mag-amps.
    • Nanocrystalline Cores:
      Opens in new tab
      These materials, often iron-based, also provide high permeability and low core loss, along with high saturation flux density and excellent temperature characteristics, as noted by manufacturers like Mag Inc. .
    • Permalloy :
      Opens in new tab
      While a lower-cost option for lower-frequency applications (under 50 kHz), Permalloy offers high permeability and low hysteresis loss but generally has higher core losses than amorphous materials.
    Applications in Precision Mag-Amps
    • High-Precision Output Regulation:
      Opens in new tab
      Mag-amps, utilizing these cores, provide very tight output voltage stability (e.g., ±1%) in switching power supplies.
    • High-Current and Low-Voltage Applications:
      Opens in new tab
      The mag-amp method is particularly effective and economical for low-voltage, high-current outputs found in power supplies for information processing, communication, and office equipment.
    • High-Frequency Operation:
      Opens in new tab
      These cores are crucial for high-frequency (100 kHz – 1 MHz) power supply designs where traditional regulators face efficiency limitations.
    • Buy Amorphous Mag-amp Core - Shinhom
      1. High squareness(~98%); 2. Low coercive force field; 3. Low temperature rise; 4. High efficiency; 5. Low reset current requireme...
      Shinhom
    • １. Saturable Cores for Mag-Amps MT / - Mouser Electronics
      The Mag-amp method is one of several output voltage regulation methods used in switching power supplies. A saturable core is used ...
      Mouser Electronics
    • Mag Amp Cores and Materials
      Permalloy 80. Permalloy 80 is an ideal material for SMPS applications. Squareness is almost as high as the cobalt based amorphous ...
      Vogel Communications Group
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    Mag Amp Cores and Materials


    Vogel Communications Group
    https://p7f.vogel.de › companies › mag-amp-cores...
    Vogel Communications Group
    https://p7f.vogel.de › companies › mag-amp-cores...
    PDF
    Permalloy cores offer the advantage of lower core cost . Cobalt Based very high permeability, high square- ness and low coercive force. These characteristics ...
    12 pages

    Magnetics Nanocrystalline Cores for Magnetic Amplifiers


    Mag Inc.
    https://www.mag-inc.com › News › August-2023 › Ma...
    Mag Inc.
    https://www.mag-inc.com › News › August-2023 › Ma...
    Aug 30, 2023 — Nanocrystalline cores are often used in magnetic amplifiers due to their unique magnetic properties including high permeability, low coercivity, and low core ...
    Missing: Precision ‎| Show results with: Precision

    Nanocrystalline Cores for Amplifiers


    TI-Electronic
    https://www.ti-electronic.com › nanocrystalline-cores-fo...
    TI-Electronic
    https://www.ti-electronic.com › nanocrystalline-cores-fo...
    Optional: Co-based amorphous versions available for ultra-low coercivity and enhanced magnetic precision, ideal for high-end or mission-critical power supplies.

    Nanocrystalline Cores for Mag-AMP for SMPS Desktop ...


    Made-in-China.com
    https://kingmagnetics.en.made-in-china.com › product
    Made-in-China.com
    https://kingmagnetics.en.made-in-china.com › product
    Nanocrystalline cores for magnetic amplifiers( Mag - Amp ), are heat treated by longitudinal magnetic field, have high saturation flux density (Bs),high rectangle ...
    Free delivery

    High Performance Amorphous and Nanocrystalline Cores


    King Magnetics
    http://www.kingmagnetics.com › kingmagnetics_...
    King Magnetics
    http://www.kingmagnetics.com › kingmagnetics_...
    PDF
    Co-base mag-amp core has more lower coercivity and higher efficiency, suitable for high-end computer power supplies. Page 14. King Magnetics - High ...
    16 pages

    High Performance Square Loop Cores Technical Bulletin


    Itaca Magnetics
    https://itacamagnetics.com › 2019/09 › 08-magamp
    Itaca Magnetics
    https://itacamagnetics.com › 2019/09 › 08-magamp
    PDF
    Mag amps are particularly well suited for outputs with currents of 1 amp to ... • Low coercive field – indicating a small reset current. • Low profile ...
    6 pages
    Missing: Coercivity ‎| Show results with: Coercivity

    Amorphous Magnetic Cores For High Frequency Electronics


    Hill Technical Sales
    https://www.hilltech.com › Amorphous_Shielding
    Hill Technical Sales
    https://www.hilltech.com › Amorphous_Shielding
    These forms offer a unique combination of high saturation induction (1.56 T), high permeability and low core loss and can be configured into various shapes, ...
    Missing: Coercivity ‎| Show results with: Coercivity

    Soft Magnetic Applications Guide


    Arnold Magnetic Technologies
    https://www.arnoldmagnetics.com › 2017/10 › F...
    Arnold Magnetic Technologies
    https://www.arnoldmagnetics.com › 2017/10 › F...
    PDF
    Bobbin cores are characterized by very high permeability at low flux levels, square loop response, and very low coercivity . ... Toroid tape core for mag amp ...

    ‌Amorphous Mag-Amp Cores: Revolutionizing Precision in ...


    Shinhom
    https://www.shinhom.com › News
    Shinhom
    https://www.shinhom.com › News
    May 1, 2025 — The Mag - Amp technique utilizes saturable reactors to regulate auxiliary outputs by controlling the magnetic permeability of the core material.
    Missing: Coercivity ‎| Show results with: Coercivity

    Nanocrystalline Core for Magnetic Amplifier China Manufacturer


    amorphousoem.com
    https://www.amorphousoem.com › Solid Core
    amorphousoem.com
    https://www.amorphousoem.com › Solid Core
    Made from Fe–Cu–Nb–Si–B nanocrystalline alloy, these cores offer ultra-high permeability, low coercivity , and a rectangular B-H curve.

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