# EMCD with an electron vortex filter: Limitations and possibilities

## TL;DR

This paper explores the potential of using an electron vortex filter for EMCD detection, highlighting its advantages over traditional methods and discussing current limitations in experimental count rates.

## Contribution

It introduces a vortex filter-based approach to EMCD that relaxes alignment requirements and assesses its feasibility through theoretical estimates and experimental tests.

## Key findings

- Magnetic dichroism can be detected theoretically.
- Count rates are too low in current experimental setups.
- The approach broadens EMCD applicability to new materials.

## Abstract

We discuss the feasibility of detecting spin polarized electronic transitions with a vortex filter. This approach does not rely on the principal condition of the standard energy loss magnetic chiral dichroism (EMCD) technique, the precise alignment of the crystal, and thus paves the way for the application of EMCD to new classes of materials and problems. The dichroic signal strength in the L$_{2,3}$-edge of ferromagnetic cobalt is estimated on theoretical grounds. It is shown that magnetic dichroism can, in principle, be detected. However, as an experimental test shows, count rates are currently too low under standard conditions.