Heating of magnetic material by hysteresis effects
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United States of America Patent
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Jul 29, 2003
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N/A
app pub date -
Dec 20, 2001
filing date -
Mar 3, 1999
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Abstract
A magnetic material having a magnetic heating efficiency of at least 4.5.times.10.sup.-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.times.10.sup.8 A/m.s, and the frequency of the applied filed is at least 20 kHz. The ideal magnetic material is characterized by a perfectly rectangular hysteresis loop, i.e. loop squareness of 1, with coercivity of 25 kA/m or less and high saturation magnetization. Preferably the magnetic material has a predominately cubic magnetic crystalline anisotropy. Preferably the magnetic material is a substituted magnetite (Fe.sub.3 O.sub.4) or .gamma.-ferric oxide (.gamma.Fe.sub.2 O.sub.3) crystalline lattice in which some of the iron atoms in that crystalline lattice have been substituted for one or more alternate metals atoms. Desirably, the metal atom is a member of the group: cobalt, zinc, nickel, manganese, magnesium, copper, chromium, gallium, cadmium.
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