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Heating of magnetic material by hysteresis effects

  • US 6,599,234 B1
  • Filed: 12/20/2001
  • Issued: 07/29/2003
  • Est. Priority Date: 03/03/1999
  • Status: Expired due to Term
First Claim
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1. A magnetic material having a magnetic heating efficiency of at least 4.5×

  • 10

    8
    J.m/A.g in a cyclic magnetic field where the product of the amplitude and frequency of the applied field is less than or equal to 5×

    108 A/m.s, and the frequency of the applied field is at least 20 kHz and wherein (i) the magnetic material is a substituted magnetite (Fe3O4) or gamma ferric oxide (γ

    -Fe2O3) crystalline lattice in which some of the iron atoms in that crystalline lattice have been substituted for one or more alternate metal atoms and (ii) the magnetic material has a predominantly cubic magnetocrystalline anisotropy.

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