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首页> 外文期刊>Journal of Experimental and Theoretical Physics >The Incommensurate Magnetic Structure of a Tetragonal Antiferromagnet with Antisymmetric Exchange
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The Incommensurate Magnetic Structure of a Tetragonal Antiferromagnet with Antisymmetric Exchange

机译：具有反对称交换的四方反铁磁体的不对称磁性结构

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Analysis of the incommensurate magnetic structure that emerges for two coexisting types of the antisymmetric Dzyaloshinski–Moriya exchange interaction (the weakly ferromagnetic component of vec tor D along the tetragonal axis and the helicoidal component distributed in the tetragonal plane) is carried out for the first time for a tetragonal antiferromagnet. The helicoidal component for each pair of interacting spins has a 2D distribution; its direction in the tetragonal plane depends on the direction of the exchange bond in each pair. The Lifshits invariant of the Ginzburg–Landau functional is obtained, which is respon sible for the formation of an incommensurate magnetic structure for such a distribution. It is shown in the mean field approximation that the incommensurate magnetic structure that forms in this case is a nonlinear double helicoid with a modulation vector lying in the tetragonal plane and with a varying angle between the polarization planes of quasiantiferromagnetic sublattices. The ground state of the magnet is degenerate in the orientation of the modulation vector in the tetragonal plane. The rate of variation in the orientations of moments in the polarization planes passing through the tetragonal axis is controlled by the angle between the directions of the moments and the tetragonal axis. The local weakly ferromagnetic moment remaining in the polarization plane varies in magnitude and sign. The relation between the orientations of the modu lation and polarization vectors is derived for the cases of simple and inversion tetragonal axes in the space symmetry group of the crystal
机译：首次分析了两种共存类型的反对称Dzyaloshinski-Moriya交换相互作用（矢量D沿四方轴的弱铁磁成分和分布在四方平面中的螺旋状成分）出现的不对称磁性结构用于四方反铁磁体。每对相互作用的自旋的螺旋成分具有2D分布;它在四边形平面上的方向取决于每对交换键的方向。获得了Ginzburg-Landau泛函的Lifshits不变式，它负责为这种分布形成不相称的磁性结构。在平均场近似中表明，在这种情况下形成的不相称的磁性结构是非线性双螺旋，其调制矢量位于四边形平面内，并且在准顺铁磁亚晶格的极化平面之间具有变化的角度。磁体的基态在调制向量在四边形平面中的方向上退化。穿过四方轴的偏振面中的弯矩方向的变化率由弯矩方向与四方轴之间的角度控制。保留在极化平面中的局部弱铁磁矩在大小和符号上变化。对于晶体空间对称群中的简单四方轴和反四方轴的情况，推导了调制方向与偏振矢量之间的关系。

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