Observation of nanoscale magnetic fields using twisted electron beams

Grillo, V. et al. (2017) Observation of nanoscale magnetic fields using twisted electron beams. Nature Communications, 8, 689. (doi: 10.1038/s41467-017-00829-5) (PMID:28947803) (PMCID:PMC5613010)

Abstract

Electron waves give an unprecedented enhancement to the field of microscopy by providing higher resolving power compared to their optical counterpart. Further information about a specimen, such as electric and magnetic features, can be revealed in electron microscopy because electrons possess both a magnetic moment and charge. In-plane magnetic structures in materials can be studied experimentally using the effect of the Lorentz force. On the other hand, full mapping of the magnetic field has hitherto remained challenging. Here we measure a nanoscale out-of-plane magnetic field by interfering a highly twisted electron vortex beam with a reference wave. We implement a recently developed holographic technique to manipulate the electron wavefunction, which gives free electrons an additional unbounded quantized magnetic moment along their propagation direction. Our finding demonstrates that full reconstruction of all three components of nanoscale magnetic fields is possible without tilting the specimen.Beyond high resolving power, electron microscopy can be used to study both the electronic and magnetic properties of a sample. Here, Grillo et al. combine electron vortex beams with holographic detection to measure out-of-plane nanoscale magnetic fields.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Boyd, Professor Robert
• Authors: Grillo, V., Harvey, T. R., Venturi, F., Pierce, J. S., Balboni, R., Bouchard, F., Carlo Gazzadi, G., Frabboni, S., Tavabi, A. H., Li, Z.-A., Dunin-Borkowski, R. E., Boyd, R. W., McMorran, B. J., and Karimi, E.
• College/School: College of Science and Engineering > School of Physics and Astronomy
• Journal Name: Nature Communications
• Publisher: Nature Research
• ISSN: 2041-1723
• ISSN (Online): 2041-1723
• Copyright Holders: Copyright © 2017 The Authors
• First Published: First published in Nature Communications 8: 689
• Publisher Policy: Reproduced under a Creative Commons license