Observation of nanoscale magnetic fields using twisted electron beams

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 and Ebrahim Karimi ()
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Vincenzo Grillo: CNR-Istituto Nanoscienze, Centro S3
Tyler R. Harvey: University of Oregon
Federico Venturi: CNR-Istituto Nanoscienze, Centro S3
Jordan S. Pierce: University of Oregon
Roberto Balboni: CNR-IMM Bologna
Frédéric Bouchard: University of Ottawa
Gian Carlo Gazzadi: CNR-Istituto Nanoscienze, Centro S3
Stefano Frabboni: CNR-Istituto Nanoscienze, Centro S3
Amir H. Tavabi: Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons and Peter Grünberg Institute
Zi-An Li: Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons and Peter Grünberg Institute
Rafal E. Dunin-Borkowski: Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons and Peter Grünberg Institute
Robert W. Boyd: University of Ottawa
Benjamin J. McMorran: University of Oregon
Ebrahim Karimi: University of Ottawa

Nature Communications, 2017, vol. 8, issue 1, 1-6

Abstract: 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.

Date: 2017
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DOI: 10.1038/s41467-017-00829-5

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