Understanding electron magnetic circular dichroism in a transition potential approach

Abstract

This paper introduces an approach based on transition potentials for inelastic scattering to understand the underlying physics of electron magnetic circular dichroism (EMCD). The transition potentials are sufficiently localized to permit atomic-scale EMCD. Two-beam and three-beam systematic row cases are discussed in detail in terms of transition potentials for conventional transmission electron microscopy, and the basic symmetries which arise in the three-beam case are confirmed experimentally. Atomic-scale EMCD in scanning transmission electron microscopy (STEM), using both a standard STEM probe and vortex beams, is discussed.

A Study on the Relationship of Magnetic Moments Orientation in L10 Fept Network Nanostructured Film by Electron Energy-Loss Magnetic Chiral Dichroism Using Semi-Core Excitation Spectra

“…Electron energy-loss magnetic chiral dichroism (EMCD), an electron counterpart of XMCD, was first proposed theoretically in 2006 (currently referred to as 'classical EMCD'; [2]), and since then has undergone subsequent development both theoretically [3][4][5][6][7][8][9][10] and experimentally. Furthermore, it was branched into several technically varying schemes such as atomic column/plane resolution EMCD, which is an extension of conventional EMCD, and the vortex beam methods utilizing stronger magnetic interactions between the incident probe exhibiting an orbital angular moment and magnetic materials [11][12][13][14][15][16][17].…”