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Article overview
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Micromagnetic study of flux-closure states in Fe dots using quantitative Lorentz Microscopy | | Aurélien Masseboeuf
; Pascale Bayle-Guillemaud
; Olivier Fruchart
; Fabien Cheynis
; Jean-Christophe Toussaint
; A. Marty
; | | Date: |
31 May 2011 | | Abstract: | A micromagnetic study of epitaxial micron-sized iron dots is reported through
the analysis of Fresnel contrasts in Lorentz Microscopy. Various types of
flux-closure micromagnetic states are evidenced and reconstructed using the
Transport of Intensity Equation, from the simple Landau state with a single
central Bloch domain wall to so-called diamond and multiple diamond states. The
former was used to investigate various aspects of asymmetric Bloch domain
walls. First, the experimental width of such complex walls was derived whose
value and thickness-dependence was analysed with the help of numerical
simulations. Moreover, quantitative datas on the magnetization inside the dot
was retrieved and informations on the degrees of freedom of such walls was
extracted. Finally, it is shown how the existence and the propagation of a
surface vortex can be characterized and monitored. This demonstrates the
ability to reach a magnetic sensitivity a priori hidden in Fresnel contrasts,
based on an original image treatment and backed-up by the evaluation of
contrasts obtained from micromagnetic simulations. | | Source: | arXiv, 1105.6295 | | Services: | Forum | Review | PDF | Favorites | |
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