%0 Journal Article
%A Nepijko, S.A.
%A Krasyuk, A.
%A Oelsner, A.
%A Schneider, C.M.
%A Schonhense, G.
%T Quantitative measurements of magnetic stray field dynamics of Permalloy particles in a photoemission electron microscopy
%J Journal of Microscopy
%V 242
%M PreJuSER-19964
%P 216  -220
%D 2011
%Z Record converted from VDB: 12.11.2012
%X By example of a Permalloy particle (40 × 40 μm(2) size, 30 nm thickness) we demonstrate a procedure to quantitatively investigate the dynamics of magnetic stray fields during ultrafast magnetization reversal. The measurements have been performed in a time-resolving photoemission electron microscope using the X-ray magnetic circular dichroism. In the particle under investigation, we have observed a flux-closure-dominated magnetic ground structure, minimizing the magnetic stray field outside the sample. A fast magnetic field pulse introduced changes in the micromagnetic structure accompanied with an incomplete flux closure. As a result, stray fields arise along the edges of domains, which cause a change of contrast and an image deformation of the particles geometry (curvature of its edge). The magnetic stray fields are calculated from a deformation of the X-ray magnetic circular dichroism (XMCD) images taken after the magnetic field pulse in a 1 ns interval. These measurements reveal a decrease of magnetic stray fields with time. An estimate of the lower limit of the domain wall velocity yields about 2 × 10(3) m s(-1).
%K J (WoSType)
%F PUB:(DE-HGF)16
%9 Journal Article
%$ pmid:21155993
%U <Go to ISI:>//WOS:000289163900012
%R 10.1111/j.1365-2818.2010.03472.x
%U https://juser.fz-juelich.de/record/19964