论文标题
Bloch和Neel Walls共线抗铁磁铁的共存
Co-existence of Bloch and Neel walls in a collinear antiferromagnet
论文作者
论文摘要
我们使用纳米级扫描钻石磁力测定法和第二谐波生成显微镜解决了模型AntiferRomagnet $ \ text {cr} _2 \ text {o} _3 $的域壁结构。我们发现180美元$^\ circ $域壁主要类似于Bloch，并且可以与具有明显的面内各向异性的晶体中的Néel壁共存。在后一种情况下，垂直于磁性易于轴的néel壁采用明确的手性。我们进一步报告了域壁宽度和表面磁化的定量测量。我们的结果提供了基本的输入和实验方法，用于理解纯，内在的抗铁磁体中的结构壁，这与在抗铁磁化合物中实现域壁运动的电控制有关。
We resolve the domain-wall structure of the model antiferromagnet $\text{Cr}_2\text{O}_3$ using nanoscale scanning diamond magnetometry and second-harmonic-generation microscopy. We find that the 180$^\circ$ domain walls are predominantly Bloch-like, and can co-exist with Néel walls in crystals with significant in-plane anisotropy. In the latter case, Néel walls that run perpendicular to a magnetic easy axis acquire a well-defined chirality. We further report quantitative measurement of the domain-wall width and surface magnetization. Our results provide fundamental input and an experimental methodology for the understanding of domain walls in pure, intrinsic antiferromagnets, which is relevant to achieve electrical control of domain-wall motion in antiferromagnetic compounds.
