Study on the interaction between different kinds of transition-metal elements incorporated in semiconductors and creation of novel magnetic semiconductors

我们研究了在II-VI化合物中掺入两种过渡金属元素的四元混晶的磁性，旨在阐明不同类型的过渡金属元素之间的相互作用，并寻求新的磁性的可能性。在(Cd，Mn，Cr)Te的情况下，发现在三元化合物(Cd，Mn)Te中，由于掺入少量的铬，Mn之间的相互作用由原来的反铁磁性转变为铁磁性。这一结果表明，同时在晶体中掺入锰和铬可以增强铁磁性。另一方面，在(Zn，Cr，Fe)Te的情况下，在一定的铬含量下，随着Fe含量的增加，饱和磁化强度减小，而矫顽力增大，这表明Cr和Fe之间存在着反铁磁相互作用。

We have investigated the magnetic properties of quaternary mixed crystals in which two kinds of transition-metal elements are incorporated in II-VI compounds, with an aim to clarify the interaction between different kinds of transition-metal elements and to seek the possibility of novel magnetism. In the case of (Cd,Mn,Cr)Te, it is found that the interaction between Mn, which is antiferromagnetic in the ternary compound (Cd,Mn)Te, turns to ferromagnetic by the incorporation of a small amount of Cr. This result indicates that the ferromagnetism is enhanced by incorporating Mn and Cr simultaneously in the crystals. On the other hand, in the case of (Zn,Cr,Fe)Te, it is found that the saturation magnetization decreases and the coercive force increases with the increase of the Fe composition at a constant Cr composition, which suggests the antiferromagnetic interaction between Cr and Fe.