Proposal for measuring magnetism with patterned apertures

TL;DR

This paper introduces a novel magnetic measurement technique using a specially shaped aperture in a transmission electron microscope, enabling magnetic analysis without complex probe shaping and applicable across various beam sizes.

Contribution

The paper presents a new method for magnetic measurement in electron microscopy that simplifies setup and broadens applicability compared to previous techniques.

Findings

Compatible with standard microscopes

Works across a wide range of beam sizes

Eliminates need for complex probe shaping

Abstract

We propose a magnetic measurement method utilizing a patterned post-sample aperture in a transmission electron microscope. While utilizing electron magnetic circular dichroism, the method circumvents previous needs to shape the electron probe to an electron vortex beam or astigmatic beam. The method can be implemented in standard scanning transmission electron microscopes by replacing the spectrometer entrance aperture with a specially shaped aperture, hereafter called ventilator aperture. The proposed setup is expected to work across the whole range of beam sizes -- from wide parallel beams down to atomic resolution magnetic spectrum imaging.