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Full Description
This book describes energy loss magnetic chiral dichroism (EMCD), a phenomenon in energy loss spectroscopy discovered in 2006. EMCD is the equivalent of XMCD but is based on fast probe electrons in the electron microscope. A spatial resolution of 2 nm has been demonstrated, and the lattice-resolved mapping of atomic spins appears feasible. EMCD is, thus, a promising technique for magnetic studies on the nanometer and sub-nanometer scale, providing the technical and logistic advantages of electron microscopy, such as in situ chemical and structural information, easy access, and low cost.
Contents
Basic Concepts: Momentum Resolved ELNES. Relativistic Effects and the Magic Angle. An Introduction to XMCD. Chirality in EELS and the Role of the Angular Momentum. Calculation Methods: Multiplet Methods. DFT Methods. Multiple-Scattering Theory of Circular Dichroism. Experimental Chiral/Circular Dichroism: EMCD Techniques and Geometries. Data Treatment, Artefacts, Noise. The Role of the Crystal. Sum Rules in EMCD and XMCD. Related Techniques and Perspectives: Magnetic Dichroism in X-Ray Holography. Prospects for Spin Mapping with Atomic Resolution.