Linear and Chiral Dichroism in the Electron Microscope

by Peter Schattschneider (Editor)

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Synopsis of Linear and Chiral Dichroism in the Electron Microscope

The growing interest in the miniaturization of magnetic storage media and the quest for novel spintronics applications rely on element specific detection of spin and orbital magnetic moments in a solid. The most sophisticated technique to reach this aim has been XMCD (X-ray magnetic circular dichroism), largely used in synchrotron beam lines. The spatial resolution limit of this technique is of the order of 20 - 50 nm. This poses a sensible limit for the study of nanostructured devices. This book describes EMCD (energy loss magnetic chiral dichroism), a phenomenon in energy loss spectroscopy discovered in 2006. It is the equivalent of XMCD, but based on fast probe electrons in the electron microscope. A spatial resolution of 2 nm has been demonstrated, and lattice resolved mapping of atomic spins appears feasible. EMCD is thus a promising technique for magnetic studies on the nanometre and sub-nanometre scale, providing the technical and logistic advantages of electron microscopy such as in situ chemical and structural information, easy access and low cost.