Hébert C, Schattschneider P, Rubino S, Novak P, Rusz J, Stöger-Pollach M
CIME-SB, MXC132, EPLF, 1015 Lausanne, Switzerland.
Ultramicroscopy. 2008 Feb;108(3):277-84. doi: 10.1016/j.ultramic.2007.07.011. Epub 2007 Nov 13.
The measurement of circular dichroism in the electron microscope is a new, emerging method and, as such, it is subject to constant refinement and improvement. Different ways can be envisaged to record the signal. We present an overview of the key steps in the energy-loss magnetic chiral dichroism (EMCD) experiment as well as a detailed review of the methods used in the intrinsic way where the specimen is used as a beam splitter. Lateral resolution up to 20-30 nm can be achieved, and the use of convergent beam techniques leads to an improved S/N ratio. Dichroic effects are shown for Ni and Co single crystal; as a counterexample, measurements were carried also for a non-magnetic (Ti) sample, where no dichroic effect was found.
在电子显微镜中测量圆二色性是一种新兴方法，因此，它需要不断完善和改进。可以设想通过不同方式来记录信号。我们概述了能量损失磁手性二色性（EMCD）实验的关键步骤，并详细回顾了将样品用作分束器的本征方式中所使用的方法。可以实现高达20 - 30纳米的横向分辨率，并且使用会聚束技术可提高信噪比。展示了镍和钴单晶的二色性效应；作为反例，还对非磁性（钛）样品进行了测量，未发现二色性效应。
