Nanometer-scale magnetic resonance imaging
Nanometer-scale magnetic resonance imaging
复制标题
纳米级磁共振成像
DOI：
10.1063/1.1666983
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发表时间：
2004
影响因子：
1.6
通讯作者：
J. Sidles
中科院分区：
文献类型：
--
作者：
S. Chao;William M. Dougherty;J. Garbini;J. Sidles
磁共振力显微镜（MRFM）通过机械力检测来成像共振自旋的三维空间分布。MRFM中的图像重建是具有挑战性的，因为共振发生在超出扫描范围的强烈弯曲的壳体中。与传统的磁共振成像相比，傅立叶技术工作良好，弯曲壳共振几何固有的MRFM需要新的重建方法。在这里，我们展示了迭代重建在电子自旋共振成像实验中的应用与80 nm的体素。重建图像的总扫描体积为0.5立方微米，由曲率半径为2.3 μm的磁共振壳产生。成像对象是一个顺磁性掺杂的固体与倾斜的表面。重建的图像正确地识别了表面的位置和方向，并映射了固体内的自旋分布。MRFM的应用包括半导体中掺杂剂分布的三维纳米尺度映射、薄膜磁性的研究和自旋扩散物理。MRFM的最终目标是在原子尺度上直接观察分子结构。
Magnetic resonance force microscopy (MRFM) images the three-dimensional spatial distribution of resonant spins by mechanical force detection. Image reconstruction in MRFM is challenging because the resonance occurs in a strongly curved shell that extends beyond the scan range. In contrast with conventional magnetic resonance imaging, where Fourier techniques work well, the curved-shell resonant geometry inherent to MRFM requires novel reconstruction methods. Here, we show the application of iterative reconstruction in an electron spin resonance imaging experiment with 80 nm voxels. The reconstructed image has a total scan volume of 0.5 cubic micrometers, and was generated by a magnetic resonant shell with a curvature radius of 2.3 μm. The imaged object was a paramagnetically doped solid with an obliquely tilted surface. The reconstructed image correctly identified the location and orientation of the surface, and mapped the spin distribution within the solid. Applications of MRFM include three-dimensional nanometer-scale mapping of dopant distributions in semiconductors, studies of magnetism of thin films, and spin diffusion physics. An ultimate goal of MRFM is the direct observation of molecular structure at the atomic scale.