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| Home > Publications database > Quantitative measurements of magnetic stray field dynamics of Permalloy particles in a photoemission electron microscopy |
| Journal Article | PreJuSER-19964 |
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2011
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Please use a persistent id in citations: doi:10.1111/j.1365-2818.2010.03472.x
Abstract: 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).
Keyword(s): J ; Magnetic stray fields (auto) ; magnetization reversal (auto) ; Permalloy particle (auto) ; photoemission electron microscope (auto)
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