Heating of magnetic material by hysteresis effects
    1.
    发明授权
    Heating of magnetic material by hysteresis effects 有权
    通过滞后效应对磁性材料进行加热

    公开(公告)号:US06599234B1

    公开(公告)日:2003-07-29

    申请号:US09914714

    申请日:2001-12-20

    IPC分类号: A61F200

    摘要: 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 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 (Fe3O4) or &ggr;-ferric oxide (&ggr;Fe2O3) 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.

    摘要翻译: 在循环磁场中具有至少4.5×10-8Jm / Ag的磁加热效率的磁性材料,其中所施加的场的振幅和频率的乘积小于或等于5×10 8 A / ms, 所施加的场地至少为20kHz。 理想的磁性材料的特征在于具有完全矩形的磁滞回线,即1的环形矩形度,矫顽力为25kA / m以下,高的饱和磁化强度。 优选地,磁性材料具有主要立方体的磁结晶各向异性。 优选地,磁性材料是取代的磁铁矿(Fe 3 O 4)或γ-氧化铁(γFe2 O 3)晶格,其中该晶格中的一些铁原子已被一个或多个替代金属原子取代。 理想地,金属原子是钴,锌,镍,锰,镁,铜,铬,镓,镉的成员。