arXiv 2201.064502022-01-19cond-mat.mtrl-sciquant-ph

面内大磁场中氮空位中心的扫描磁测量

Scanning nitrogen-vacancy center magnetometry in large in-plane magnetic fields

P. Welter, J. Rhensius, A. Morales, M. S. Wörnle, C. -H. Lambert, G. Puebla-Hellmann, P. Gambardella, C. L. Degen

备注：: 6 pages, 3 figures
DOI：: 10.1063/5.0084910

摘要：

金刚石中氮空位中心的扫描磁强计已成为研究纳米级弱杂散场模式的强大显微镜。然而，由于自旋缺陷的内部晶体各向异性，外部偏置场-对于磁性材料的研究至关重要-必须沿特定的空间方向施加。特别地，由{100}切割金刚石制成的最常见的金刚石探针仅支持与表面法线成$θ= 55^\circ$角的场。在本文中，我们报告了扫描金刚石探针的{110}切割金刚石的自旋各向异性轴位于扫描平面（$θ=90^\circ$）。我们发现，这些探头保持其灵敏度在大的平面内的领域，并展示扫描磁力计的域图案的Co-NiO膜在施加的领域高达40 mT。我们的工作扩展了扫描NV磁力测量的重要类别的材料，需要大的面内磁场。

英文摘要：

Scanning magnetometry with nitrogen-vacancy (NV) centers in diamond has emerged as a powerful microscopy for studying weak stray field patterns with nanometer resolution. Due to the internal crystal anisotropy of the spin defect, however, external bias fields -- critical for the study of magnetic materials -- must be applied along specific spatial directions. In particular, the most common diamond probes made from {100}-cut diamond only support fields at an angle of $θ= 55^\circ$ from the surface normal. In this paper, we report fabrication of scanning diamond probes from {110}-cut diamond where the spin anisotropy axis lies in the scan plane ($θ=90^\circ$). We show that these probes retain their sensitivity in large in-plane fields and demonstrate scanning magnetometry of the domain pattern of Co-NiO films in applied fields up to 40 mT. Our work extends scanning NV magnetometry to the important class of materials that require large in-plane fields.

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