Advanced-Grade Materials

Material Name Description Benefits Applications

Amorphous Alloys

Metallic glass materials without a crystalline structure and with better electrical conductivity than conventional materials
  • High tensile strength.
  • Excellent resistance to fracture and corrosion.
  • Large amount of elastic deformation
  • For high frequency, low loss applications
  • Inductors
  • Energy storage inductors
  • Saturable cores

Cobalt Iron

Fe/Co is a soft magnetic material with an extremely high magnetization saturation.
  • Best for applications requiring reduced size and weight
  • Aircraft generators,
  • Electric motors,
  • Magnetic bearings.


3% Si/Fe grain-oriented silicon iron alloy. It’s squareness ratio and gain is lower than for Square 50, while core losses are higher.
  • Least expensive of the Square Loop materials.
  • Very high maximum flux.
  • Ideal for high power, relatively low frequency applications.
  • For high performance applications
  • Power Transformers,
  • Saturable Reactors,
  • Inverter Transformers,
  • Magnetic Amplifiers (Power),
  • Current Transformers,
  • Output Transformers.

Nanocrystalline Alloys

Materials comprised of single- and multi-phase polycrystalline structures that have higher magnetic properties than conventional materials.
  • High strength and hardness.
  • Reduced elastic modules.
  • Large heat capacity and thermal expansion coefficient.
  • For high frequency applications,
  • Current transformers,
  • GFCI transformers,
  • Inductors,
  • Industrial controls,
  • For wide range temperature applications.

Square 50

50% Ni/Fe/ grain-oriented alloy. It has Bm as well as cores losses so low it can be used in higher frequency applications than the silicon steels.
  • Highest squareness ratio possible (lowest saturated reactance).
  • Very high gain.
  • Ideal wherever an extremely square loop/close tolerance material is required.
  • Bi-stable switching devices,
  • Inverter transformers,
  • High performance power magnetic amplifiers
  • Linear current transformers,
  • Timing devices,
  • Driver transformers.

Square 80

80% Ni/Fe/Mo. It is a low coercive force material with similar characteristics to SupermalloyTM
  • Good squareness and high gain.
  • Low core losses.
  • Low power, high efficiency inverter transformers,
  • Low level, high frequency magnetic amplifiers & modulators,
  • Pulse transformers.

Super Square 80

80% Ni/Fe/Mo. It has higher maximum flux density, gain, and squareness ratio than Square 80.
  • Provides remarkable core uniformity.
  • Very slight increase in coercive force.
  • Wherever a high degree of thermal stability is required for certain magnetic characteristics like Bm/Br, H, δH.


80% Ni/Fe/Mo. This alloy is processed for exceptionally high initial permeability.
  • Designed for very low level or high value applications.
  • Very low-level Signal Transformers,
  • Low level Magnetic Preamplifiers,
  • High value Inductors without superimposed direct currents,
  • Precision Current Transformers.


49% Co/49% Fe/V. It is the highest flux density material available in tape wound cores.
  • Ideal wherever size and weight are a major design consideration.
  • Power Transformers,
  • Power Magnetic Amplifiers,
  • Inverters.

SuperPermTM 49

50% Ni/Fe/ Alloy. This material has characteristics that fall between Silicon Steel and 80% Ni/Fe/Mo.
  • Provides high initial permeability.
  • Has high maximum flux.
  • Current Transformers,
  • Proportioning Reactors,
  • High quality/wide frequency Response Transformers,
  • Medium power Magnetic Amplifiers.

SuperPermTM 80

80% Ni/Fe/Mo. Similar to SupermalloyTM but processed for pulse and high frequency performance. 
  • Designed for very low-level signal applications.
  • Ideal for high frequency applications.
  • Very low-level signal transformers,
  • Low level and high frequency magnetic preamplifiers,
  • High value/high frequency inductors.