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000019964 0247_ $$2DOI$$a10.1111/j.1365-2818.2010.03472.x
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000019964 041__ $$aeng
000019964 084__ $$2WoS$$aMicroscopy
000019964 1001_ $$0P:(DE-HGF)0$$aNepijko, S.A.$$b0
000019964 245__ $$aQuantitative measurements of magnetic stray field dynamics of Permalloy particles in a photoemission electron microscopy
000019964 260__ $$c2011
000019964 300__ $$a216  -220
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000019964 440_0 $$025425$$aJournal of Microscopy$$v242$$y2
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000019964 520__ $$aBy 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).
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000019964 65320 $$2Author$$aMagnetic stray fields
000019964 65320 $$2Author$$amagnetization reversal
000019964 65320 $$2Author$$aPermalloy particle
000019964 65320 $$2Author$$aphotoemission electron microscope
000019964 650_7 $$2WoSType$$aJ
000019964 7001_ $$0P:(DE-HGF)0$$aKrasyuk, A.$$b1
000019964 7001_ $$0P:(DE-HGF)0$$aOelsner, A.$$b2
000019964 7001_ $$0P:(DE-Juel1)130948$$aSchneider, C.M.$$b3$$uFZJ
000019964 7001_ $$0P:(DE-HGF)0$$aSchonhense, G.$$b4
000019964 773__ $$0PERI:(DE-600)2007259-4$$a10.1111/j.1365-2818.2010.03472.x$$gVol. 242, p. 216  -220$$p216  -220$$q242<216  -220$$tJournal of Microscopy$$v242$$y2011
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000019964 9141_ $$y2011
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