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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 …
Nature Publishing Group
Publication date: 
25 Sep 2017

Vincenzo Grillo, Tyler R Harvey, Federico Venturi, Jordan S Pierce, Roberto Balboni, Frédéric Bouchard, Gian Carlo Gazzadi, Stefano Frabboni, Amir H Tavabi, Zi-An Li, Rafal E Dunin-Borkowski, Robert W Boyd, Benjamin J McMorran, Ebrahim Karimi

Biblio References: 
Volume: 8 Issue: 1 Pages: 689
Nature Communications