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

Bibliographic Details
Title: High-sensitivity mapping of magnetic induction fields with nanometer-scale resolution: comparison of off-axis electron holography and pixelated differential phase contrast
Authors: Boureau, Victor, Staňo, Michal, Rouvière, Jean-Luc, Toussaint, Jean-Christophe, Fruchart, Olivier, Cooper, and David
Publication Year: 2020
Collection: Condensed Matter
Physics (Other)
Subject Terms: Physics - Applied Physics, Condensed Matter - Mesoscale and Nanoscale Physics
More Details: 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 modelling. State-of-the-art 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 those obtained from pixelated (or 4D) scanning transmission electron microscopy (STEM). 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 to build a map. 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 techniques is given.
Document Type: Working Paper
DOI: 10.1088/1361-6463/abc77d
Access URL: http://arxiv.org/abs/2008.09308
Accession Number: edsarx.2008.09308
Database: arXiv
More Details
DOI:10.1088/1361-6463/abc77d