Abstract

This study is devoted to magnetic neutron diffraction analysis (elastic neutron scattering yielding information about spin ordering in magnetic materials). Experimental approaches to magnetism are intensely developed mainly due to the discovery of new functional materials with unusual properties. Nevertheless, magnetic neutron diffraction analysis is a unique method, which makes it possible to directly determine magnetic structures (i.e., values and mutual orientations of magnetic moments and their orientations relative to the crystallographic axes). Neutron diffraction proved to be a good instrument for studying both simple commensurate magnetic structures in bulk samples and more complex noncollinear spiral magnets. Magnetic neutron diffraction is widely applied for studying magnetic structures in nanoscale multilayer film materials. However, bulk samples with a layered crystal structure, which can be considered as natural quasi-two-dimensional objects due to the weakness of interlayer couplings, are of greater interest for physics of low-dimensional magnetism. Our neutron diffraction studies on quasi-two-dimensional magnets, transition-metal oxides A₃M₂SbO₆ (A = Li or Na, M = Co or Ni) and rare-earth intermetallic compounds La_1–xTb_x(Ni_1–xMn_x)₂Si₂, are briefly considered.

中文翻译：

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准二维磁体的磁中子衍射

摘要

这项研究致力于磁中子衍射分析（弹性中子散射产生有关磁性材料中自旋有序的信息）。磁性的实验方法得到了大力发展，这主要是由于发现了具有非同寻常性能的新型功能材料。然而，磁中子衍射分析是一种独特的方法，它使直接确定磁结构（即磁矩的值和相互取向以及它们相对于晶体学轴的取向）成为可能。中子衍射被证明是研究大体积样品中简单相称的磁性结构以及更复杂的非共线螺旋形磁体的好工具。磁中子衍射被广泛用于研究纳米级多层膜材料中的磁性结构。然而，具有层状晶体结构的大量样品由于层间耦合的弱点而可以被视为天然准二维物体，这对低维磁性的物理学更具兴趣。我们对准二维磁体，过渡金属氧化物的中子衍射研究阿₃中号₂非晶态SbO ₆（甲= Li或Na，中号= Co或Ni）和稀土类金属间化合物的La _{1- X}铽_X（镍_{1- X}锰_X）₂的Si ₂，简要考虑。