Abstract
We probe magnetic domain walls in cylindrical soft magnetic nanowires using electron holography. We detail the modelling of expected contrast for both transverse and Bloch point domain walls and provide comparison with experimental observations performed on NiCo nanowires, involving also both magnetic and electrostatic contribution to the electron holography map. This allows the fast determination of the domain wall type without the need for uneasy and time-consuming experimental removal of the electrostatic contribution. Finally, we describe and implement a new efficient algorithm for calculating the magnetic contrast.
Highlights
In this study we were interested in imaging magnetic domain walls (DWs) in rather soft magnetic cylindrical nanowires by means of electron holography [1]
Simulation We calculated expected phase maps based on two micromagnetic configurations with a domain wall - either Transverse Wall (TW) or Bloch Point Wall (BPW)
This can be done for different wire tilts and domain wall orientation for both magnetic and electrostatic contributions to the electron phase shift
Summary
In this study we were interested in imaging magnetic domain walls (DWs) in rather soft magnetic cylindrical nanowires by means of electron holography [1]. We considered Ni60Co40 nanowires with diameter 100-150 nm, so as to favor BPWs. we observed only TWs, following nucleation with a transverse field. We show how it is necessary to consider the electrostatic potential, as well as the azimuthal degree of freedom of the transverse wall, to formally reproduce and identify the experimental contrast.
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