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    • 5. 发明授权
    • Magnetic materials with exchange anisotropy and process for their
manufacture
    • 具有交换各向异性的磁性材料及其制造方法
    • US3959032A
    • 1976-05-25
    • US535577
    • 1974-12-23
    • Eberhard KoesterGerd WunschPaul DeignerDieter GrawKarl UhlWerner Steck
    • Eberhard KoesterGerd WunschPaul DeignerDieter GrawKarl UhlWerner Steck
    • G11B5/62C09D5/23C09D7/12G11B5/706H01F1/06H01F1/09H01F1/33
    • H01F1/09G11B5/70621H01F1/0009
    • Magnetic materials which essentially consist of a phase A with a ferromagnetic spin system and a phase B with an anti-ferromagnetic spin system, phases A and B interacting by exchange coupling, and the manufacture of such materials. The materials consist essentially of two-phase magnetic single-domain particles, with the alloy [Co.sub.x Ni.sub.1.sub.-x ] as the ferromagnetic phase A and its oxidized form [(CoO).sub.x (NiO).sub.1.sub.-x ] as the anti-ferromagnetic phase B, with values of x of 0.04 to 0.96. They are manufactured by surface oxidation of a pigment layer, which at least covers the surface but may extend deeper, having the composition of phase A, to form an oxide layer, at least 40 A thick, of the phase B, followed by heating in an inert gas atmosphere, or by reduction of a corresponding layer of phase B to a layer of phase A. Magnetic single-domain particles of this composition have a Neel temperature which varies with X. As a result, materials are obtained which have an asymmetrical hysteresis loop, attributable to exchange anisotropy, at temperatures which can be varied within wide limits in accordance with the intended use of the material.
    • 磁性材料基本上由具有铁磁自旋系统的相A和具有反铁磁旋转系统的相B组成,A相和B相通过交换耦合相互作用,并且制造这种材料。 这些材料基本上由两相磁性单畴粒子组成,合金[CoxNi1-x]作为铁磁相A,其氧化形式[(CoO)x(NiO)1-x]作为反铁磁相B ,值x为0.04至0.96。 它们通过颜料层的表面氧化制造,颜料层至少覆盖表面但可以延伸得更深,具有相A的组成,以形成相B的至少40μA的氧化物层,随后加热 惰性气体气氛,或通过将相B的相应层减少到相A层。该组合物的磁性单畴颗粒具有随X变化的Neel温度。结果,获得具有不对称性的材料 可归因于交换各向异性的磁滞回线,其温度可以根据材料的预期用途在宽范围内变化。