High frequency magnetic components - Dr. Marian Kazimierczuk
https://books.google.gr/books?id=p3KHPUhaOaUC&pg=PA65&lpg=PA65&dq=νικελ+core+magnetic+permeability+vs+frequency&source=bl&ots=nhk6eL3rBB&sig=ACfU3U1o0cLfOwtdBWYCONvIyjU_aKz_Ew&hl=el&sa=X&ved=2ahUKEwiM7-vd8ITkAhUQNOwKHZg9AcwQ6AEwDXoECAoQAQ#v=onepage&q=νικελ%20core%20magnetic%20permeability%20vs%20frequency&f=false
For example the 80% Ni (Nickel) core material is called Permalloy or Mumetal
Didn't know this.
Wikipedia has very nice articles showing the difference between the two:
https://en.m.wikipedia.org/wiki/Permalloy
https://en.m.wikipedia.org/wiki/Mu-metal
See also silicon steel
https://en.m.wikipedia.org/wiki/Electrical_steel
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