论文标题
二维CRI3磁铁中的量子重新缩放，域的亚稳定性和混合域壁
Quantum rescaling, domain metastability and hybrid domain-walls in two-dimensional CrI3 magnets
论文作者
论文摘要
众所周知，高阶交换相互作用和量子效应在描述低维磁化合物的特性中起着重要作用。在这里，我们将最近发现的二维（2D）Van der Waals（VDW）CRI3视为一种量子非Heisenberg材料，其性能远远超出了最初假定的磁铁范围。我们发现，生物二极管交换相互作用对于定量描述CRI3的磁性至关重要，但需要量子重新校正以再现其热性能。由离散电子自旋和声子旋转散射过程表示的热浴的量子性质诱导了低温方向上的自旋波动的形成。这些波动会导致在几微米表面积上演变成单个宏观磁化的亚稳态磁域的形成。这样的域显示了neel和Bloch类型的混合特性，其范围壁宽的范围在3-5 nm的范围内。对于大多数2D VDW磁铁，高阶交换相互作用是可观的，预计会有类似的行为。
Higher-order exchange interactions and quantum effects are widely known to play an important role in describing the properties of low-dimensional magnetic compounds. Here we identify the recently discovered two-dimensional (2D) van der Waals (vdW) CrI3 as a quantum non-Heisenberg material with properties far beyond an Ising magnet as initially assumed. We find that biquadratic exchange interactions are essential to quantitatively describe the magnetism of CrI3 but requiring quantum rescaling corrections to reproduce its thermal properties. The quantum nature of the heat bath represented by discrete electron-spin and phonon-spin scattering processes induced the formation of spin fluctuations in the low temperature regime. These fluctuations induce the formation of metastable magnetic domains evolving into a single macroscopic magnetization or even a monodomain over surface areas of a few micrometers. Such domains display hybrid characteristics of Neel and Bloch types with a narrow domain wall width in the range of 3-5 nm. Similar behaviour is expected for the majority of 2D vdW magnets where higher-order exchange interactions are appreciable.
