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首页> 外文期刊>Indian Journal of Pure & Applied Physics >Magnetic structure and excitations of rare earth superlattices
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Magnetic structure and excitations of rare earth superlattices

机译：稀土超晶格的磁结构和激发

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摘要

Rare-earth superlattices have been grown using molecular beam epitaxy and their chemical and magnetic structure determined with X-ray and neutron diffraction techniques. When the superlattices consist of Ho and the non-magnetic materials Y or Lu, the helical magnetic order in the Ho layers propagates through the non-magnetic blocks with coherence in both the phase and chirality of the magnetic order. In contrast, when superlattices of Ho are grown with other magnetic rare earths, Er and Pr, the coherence between the ordering in the Ho blocks is either reduced or completely absent. It is suggested that the reason for this difference in behaviour is that a helical spin density wave can propagate in the non-magnetic Y and Lu, but that it is inhibited in the Er blocks by the competing c-axis magnetic ordering and in the Pr blocks by the different electronic structure and Fermi surface.
机译：稀土超晶格是使用分子束外延生长的，其化学和磁性结构是通过X射线和中子衍射技术确定的。当超晶格由Ho和非磁性材料Y或Lu组成时，Ho层中的螺旋磁阶通过非磁块传播，并且在磁阶的相位和手性上都具有相干性。相反，当Ho的超晶格与其他磁性稀土元素Er和Pr一起生长时，Ho块中有序之间的相干性降低或完全消失。有人认为，这种行为差异的原因是螺旋自旋密度波可以在非磁性的Y和Lu中传播，但是在Er块中却受到竞争的c轴磁性排序和Pr的抑制。由不同的电子结构和费米表面构成的块。

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