论文标题
通过扫描钻石磁探针显微镜检查CR2O3外延膜中抗铁磁域的纳米级成像
Nanoscale imaging of antiferromagnetic domains in epitaxial films of Cr2O3 via scanning diamond magnetic probe microscopy
论文作者
论文摘要
我们报告了使用钻石氮空位显微镜在磁性超磁体CR2O3薄膜中与抗fiferromagnetic结构域相关的边界磁化的直接成像。我们发现磁性域大小与结构晶粒尺寸之间存在相关性，并与域形成过程相关联。我们在存在磁场的情况下进行了场冷却，即从上方到低于Néel温度的冷却，从而选择了两个原本退化的180度域中的一个。由于CR2O3膜中弱寄生磁矩的Zeeman能量的Zeeman能量源于缺陷和相对接口的边界磁化的不平衡，因此仅在磁场上抬起这种退化。该边界磁化伴随着抗铁磁阶参数，从而选择了其方向。用台面结构进行CR2O3膜的纳米结构显示了可逆的边缘磁状态，在磁场冷却过程中具有磁场的方向。
We report direct imaging of boundary magnetization associated with antiferromagnetic domains in magnetoelectric epitaxial Cr2O3 thin films using diamond nitrogen vacancy microscopy. We found a correlation between magnetic domain size and structural grain size which we associate with the domain formation process. We performed field cooling, i.e., cooling from above to below the Néel temperature in the presence of magnetic field, which resulted in the selection of one of the two otherwise degenerate 180 degree domains. Lifting of such a degeneracy is achievable with a magnetic field alone due to the Zeeman energy of a weak parasitic magnetic moment in Cr2O3 films that originates from defects and the imbalance of the boundary magnetization of opposing interfaces. This boundary magnetization couples to the antiferromagnetic order parameter enabling selection of its orientation. Nanostructuring the Cr2O3 film with mesa structures revealed reversible edge magnetic states with the direction of magnetic field during field cooling.
