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The investigation of three-dimensional
(3D) ferromagnetic nanoscale
materials constitutes one of the key research areas of the current
magnetism roadmap and carries great potential to impact areas such
as data storage, sensing, and biomagnetism. The properties of such
nanostructures are closely connected with their 3D magnetic nanostructure,
making their determination highly valuable. Up to now, quantitative
3D maps providing both the internal magnetic and electric configuration
of the same specimen with high spatial resolution are missing. Here,
we demonstrate the quantitative 3D reconstruction of the dominant
axial component of the magnetic induction and electrostatic potential
within a cobalt nanowire (NW) of 100 nm in diameter with spatial resolution
below 10 nm by applying electron holographic tomography. The tomogram
was obtained using a dedicated TEM sample holder for acquisition,
in combination with advanced alignment and tomographic reconstruction
routines. The powerful approach presented here is widely applicable
to a broad range of 3D magnetic nanostructures and may trigger the
progress of novel spintronic nonplanar nanodevices.
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