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近年来研究表明,由磁性金属和非磁性材料交替沉积而成的多层膜或超晶格结构中,相邻磁层间磁矩通过非磁层的耦合,可以出现相互平行排列的铁磁态、反平行排列的反铁磁态,或互相垂直的90°耦合。当磁性多层膜中出现反铁磁耦合时,样品饱和时的磁阻R(S)小于零场时的电阻R(O),出现了所谓的巨磁电阻(giant magneto-resistance)效应,这一效应由于在磁头材料和磁敏感器件上具有广泛的用途而备受人们的关注。磁性多层膜的磁电阻比率一般要比
In recent years, it has been shown that in the multi-layer film or superlattice structure alternately deposited from magnetic metal and nonmagnetic material, the magnetic moment between adjacent magnetic layers can be parallel to each other via the non-magnetic layer. Antiparallel to the antiferromagnetic state, or 90 ° perpendicular to each other. When the anti-ferromagnetic coupling occurs in the magnetic multilayers, the magnetoresistance R (S) at saturation of the sample is smaller than the resistance R (O) at zero-field, and a so-called giant magneto-resistance effect occurs, which One effect has drawn much attention due to its wide range of uses in magnetic head materials and magnetic sensing devices. The magnetic multilayer ratio of magnetic resistance than the general