有效利用电子涡旋束测量磁性的边界条件
Boundaries for efficient use of electron vortex beams to measure magnetic properties
摘要：
在高空间分辨率下表征磁特性的实验技术的发展对于磁器件（例如，数据存储介质）的小型化的进展是必不可少的。电子涡旋束（EVB）的非弹性散射包含了原子特有的磁性信息。我们已经开发了一个理论描述的EVB在晶体上的非弹性散射，并进行了模拟不同直径的EVB。我们表明，使用EVB宽于原子间的距离并没有提供任何优势，比普通的会聚光束没有角动量。另一方面，在原子的分辨率极限，电子能量损失谱EVB测量是强烈敏感的自旋和轨道磁矩的研究物质，当通道通过或非常接近的原子柱。我们的研究结果表明，有效地使用EVB的磁性能测量的边界。
英文摘要：
Development of experimental techniques for characterization of magnetic properties at high spatial resolution is essential for progress in miniaturization of magnetic devices, for example, in data storage media. Inelastic scattering of electron vortex beams (EVB) was recently reported to contain atom-specific magnetic information. We have developed a theoretical description of inelastic scattering of EVB on crystals and performed simulations for EVB of different diameters. We show that use of an EVB wider than an interatomic distance does not provide any advantage over an ordinary convergent beam without angular momentum. On the other hand, in the atomic resolution limit, electron energy loss spectra measured by EVB are strongly sensitive to the spin and orbital magnetic moments of studied matter, when channeling through or very close to the atomic columns. Our results demonstrate the boundaries for efficient use of EVB in measurement of magnetic properties.
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