Magnetic cores



Iron-Nickel magnetic cores

There are different types of Iron-Nickel alloys, characterized by their Nickel content. We use alloys with 36%, 50% or 80% of Nickel. These alloys have a high permeability and a low coercive field. The hysteresis cycle of the FeNi50 family can be adjusted by annealing under magnetic field.

Iron-Nickel is available in strips with a thickness of 0.02 to 0.2mm and a width of 5 to 50mm.

TCT manufactures wound cores in any shape (toroidal, square, C…)

Please contact us if you have any questions about the materials used by TCT or specific dimensions.

Technical data (PDF) Add to my list


This material is mostly used in low iron loss transformers, pulse transformers, high accuracy instrument transformers, air gap magnetic cores for Hall Effect sensors and core balanced transformers, for low and medium frequency application.

Technical characteristics


  • Toric
  • Oblong
  • Rectangular
  • Elliptic
  • C shape
  • E shape
  • Cut cores
  • Wound cores



  • Naked
  • Fixing
  • Impregnation
  • Cutting
  • Taping
  • Coating
  • Casing
  • Potting

Key strengths

High permeability

Low coercive field

Saturation from 0.7T to 1.5T