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  4. High-sensitivity mapping of magnetic induction fields with nanometer-scale resolution: comparison of off-axis electron holography and pixelated differential phase contrast
 
research article

High-sensitivity mapping of magnetic induction fields with nanometer-scale resolution: comparison of off-axis electron holography and pixelated differential phase contrast

Boureau, Victor  
•
Stano, Michal
•
Rouviere, Jean-Luc
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February 25, 2021
Journal Of Physics D-Applied Physics

We compare two transmission electron microscopy (TEM) based techniques that can provide highly spatially resolved quantitative measurements of magnetic induction fields at high sensitivity. To this end, the magnetic induction of a ferromagnetic NiFe nanowire has been measured and compared to micromagnetic modeling. State-of-the-art off-axis electron holography has been performed using the averaging of large series of holograms to improve the sensitivity of the measurements. These results are then compared to those obtained from pixelated differential phase contrast, a technique that belongs to pixelated (or 4D) scanning transmission electron microscopy (STEM) experiments. This emerging technique uses a pixelated detector to image the local diffraction patterns as the beam is scanned over the sample. For each diffraction pattern, the deflection of the beam is measured and converted into magnetic induction, while scanning the beam allows a map to be generated. Aberration corrected Lorentz (field-free) configurations of the TEM and STEM were used for an improved spatial resolution. We show that the pixelated STEM approach, even when performed using an old generation of charge-coupled device camera, provides better sensitivity at the expense of spatial resolution. A more general comparison of the two quantitative techniques is given.

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Type
research article
DOI
10.1088/1361-6463/abc77d
Web of Science ID

WOS:000599105900001

Author(s)
Boureau, Victor  
Stano, Michal
Rouviere, Jean-Luc
Toussaint, Jean-Christophe
Fruchart, Olivier
Cooper, David
Date Issued

2021-02-25

Publisher

IOP PUBLISHING LTD

Published in
Journal Of Physics D-Applied Physics
Volume

54

Issue

8

Article Number

085001

Subjects

Physics, Applied

•

Physics

•

electron holography

•

pixelated dpc

•

4d-stem

•

pixelated stem

•

magnetic induction

•

electric field

•

lorentz microscopy

•

detector

•

microscopy

•

precision

•

specimens

•

stem

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
CIME  
Available on Infoscience
March 26, 2021
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/176726
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