Nanocrystalline Soft Magnetic Material FINEMET®

Proterial developed the first nanocrystalline soft magnetic material in the world, named “FINEMET®”. FINEMET® has high saturation flux density and high permeability. It also has stable temperature characteristics. FINEMET® provides excellent performance in electromagnetic noise suppression and contributes to energy saving. It will allow reduction in size and weight of electric and electronics devices as well. It is our hope, “FINEMET®” will be the best solution for your application due to its unique soft magnetic properties.

We propose a method to use materials tailored to your company.

What is FINEMET® ?

FINEMET® is crystalized alloy ribbon with main chemical composition of Fe.
This crystalized alloy have grains which are extremely uniform and small “about 10nm in size”.
FINEMET® is Proterial's original product realizes drastic improvement of magnetic characteristics.

Various product groups


  1. 1Satisfy both high saturation magnetic flux density and high permeability (High permeability, High saturation flux density)

    High saturation magnetic flux density comparable to Fe-based amorphous metal. High permeability comparable to Co-based amorphous metal.

  2. 2Low core loss (Low core loss)

    1/5th the core loss of Fe based amorphous metal and approximately the same core loss as Co-based amorphous metal.

  3. 3Excellent temperature characteristics and small aging effects (Excellent temperature characteristics)

    Small permeability variation (less than ±10%) at a temperature range of -50°C~150°C. Unlike Co-based amorphous metals, aging effects are very small.

  4. 4Low magnetostriction (Low magnetstriction)

    Less affected by mechanical stress. Very low audio noise emission.

  5. 5Excellent characteristics over wide frequency range (High squareness)

    High permeability and low core loss over wide frequency range, which is equivalent to Co-based amorphous metal.

  6. 6Flexibility to control magnetic properties“B-H curve shape”during annealing (High permeability)

    Three types of B-H curve squareness, high, middle and low remanence ratio, corresponding to various applications.


High saturated flux density, high relative permeability and low core loss. Superior to conventional materials.


Features and Typical Applications of FINEMET®

Proterial, Ltd. produces various types of soft magnetic materials, such as Permalloy, soft ferrite, amorphous metal, and FINEMET®, and we use these materials in our product's applications. We continually improve our material technology and develop new applications by taking advantage of the unique characteristics these materials provide. FINEMET® is a good example. It is our hope, FINEMET® will be the best solution for your application.

Features and Typical Applications of FINEMET® COMMON MODE CHOKE Magnetic Shielding Sheet: MS-F and MS-FR Shield Yoke Sheet for Wireless Chargers FINEMET® MS Series "FINEMET®" Pulsed Power Cores Cores for Surge Absorber Low Core Loss Noncut Core Low Core Loss Cut Cores

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Proterial America, Ltd.
Chicago Office
2101 S. Arlington Heights Road Suite 116
Arlington Heights, IL 60005-4142
TEL : +1-847-364-7200
FAX : +1-847-364-7279

Proterial Europe GmbH
Head Office
Immermannstrasse 14-16,
40210 Duesseldorf, Germany
TEL : +49-211-16009-0
FAX : +49-211-16009-60

Proterial Asia Pacific Pte. Ltd.
12 Gul Avenue, Singapore 629656
TEL : +65-6861-7711
FAX : +65-6861-9554

Proterial Hong Kong Limited
8/F., Building 20E, Phase 3, Hong Kong Science Park, Pak Shek Kok, N.T.,
Hong Kong
TEL : +852-2724-4183

Soft Magnetic Materials and Components (for FINEMET® Applied Product and Ribbon)


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