论文标题
Cubic Skyrmion宿主中自旋螺旋的田间和各向异性驱动的转变
Field and anisotropy driven transformations of spin spirals in cubic skyrmion hosts
论文作者
论文摘要
我们讨论了诸如MNSI和Cu $ _2 $ oseo $ _3 $之类的巨大手性磁铁中螺旋状态的独特特征，这些特征源于立方磁磁晶状体各向异性的效果。首先，在H $ _ {C1} $和H $ _ {C2} $的螺旋形到圆锥形和圆锥形到铁磁性过渡中，双方各向异性都会导致可逆性或不可逆的螺旋波伏型类似跳跃的重新定位。简易和硬性各向异性轴之间的微妙相互作用导致椭圆形变形的锥形状态之间的相变，几乎没有任何可检测到的变化。我们表明，现场立方和交换各向异性术语之间的竞争也可能导致倾斜状态。我们的工作为进一步的实验研究提供了明确的方向，以揭示出上述完善状态以外的立方helimagnets中的理论上预测的螺旋状态，因此可以帮助理解这些原型天际宿主的磁相图。此外，我们表明，孤立的天空的特性，例如 - 骨间吸引，方向和/或成核的特性也植根于宿主螺旋状态的性质，在这种宿主螺旋状态下，在该状态下，稳定了天空。
We discuss distinctive features of spiral states in bulk chiral magnets such as MnSi and Cu$_2$OSeO$_3$ that stem from the effect of the cubic magneto-crystalline anisotropy. First of all, at both the helical-to-conical and the conical-to-ferromagnetic transitions, taking place at H$_{c1}$ and H$_{c2}$, respectively, the cubic anisotropy leads to reversible or irreversible jump-like reorientations of the spiral wavevectors. The subtle interplay between the easy and hard anisotropy axes gives rise to a phase transition between elliptically distorted conical states almost without any detectable change in the period. We show that the competition between on-site cubic and exchange anisotropy terms can also lead to oblique spiral states. Our work gives clear directions for further experimental studies to reveal theoretically predicted spiral states in cubic helimagnets beyond the aforementioned well-established states thus, can help to understand the magnetic phase diagram of these archetypal skyrmion hosts. In addition, we show that properties of isolated skyrmions such as inter-skyrmion attraction, orientation and/or nucleation are also rooted in the properties of host spirals states, in which skyrmions are stabilized.
