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000902149 1001_ $$0P:(DE-Juel1)172928$$aDenneulin, Thibaud$$b0$$eCorresponding author
000902149 245__ $$aVisibility and Apparent Size of Néel-Type Magnetic Skyrmions in Fresnel Defocus Images of Multilayer Films
000902149 260__ $$aNew York, NY$$bCambridge University Press$$c2021
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000902149 520__ $$aMultilayers that comprise thin films of heavy metals and ferromagnets have been shown to host Néel-type magnetic skyrmions at room temperature. Fresnel defocus imaging in Lorentz transmission electron microscopy is a widely used technique for recording magnetic information about skyrmions. However, the visibility of Néel-type skyrmions in Fresnel defocus images is typically low, both because only a small component of their magnetic field contributes to the signal and because of the presence of diffraction contrast from the polycrystalline multilayer structure. Here, we take advantage of the out-of-plane hysteresis in such samples to record background-subtracted Fresnel defocus images. We demonstrate an improvement in magnetic signal-to-noise ratio and spatial resolution by a factor of 3 for a (Pt/Co/NiFe)×5 multilayer. We also use simulated Fresnel defocus images of Néel-type magnetic skyrmions to understand the influence of defocus on apparent skyrmion size.
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000902149 536__ $$0G:(DE-Juel-1)Z1422.01.18$$aDARPA, Phase 2 - Defense Advanced Research Projects Agency Manipulation of magnetic skyrmions for logicin- memory applications (Z1422.01.18)$$cZ1422.01.18$$x1
000902149 536__ $$0G:(EU-Grant)856538$$a3D MAGiC - Three-dimensional magnetization textures: Discovery and control on the nanoscale (856538)$$c856538$$fERC-2019-SyG$$x2
000902149 536__ $$0G:(EU-Grant)823717$$aESTEEM3 - Enabling Science and Technology through European Electron Microscopy (823717)$$c823717$$fH2020-INFRAIA-2018-1$$x3
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000902149 7001_ $$0P:(DE-Juel1)157760$$aCaron, Jan$$b1
000902149 7001_ $$0P:(DE-Juel1)165314$$aMüller-Caspary, Knut$$b2$$eCorresponding author
000902149 7001_ $$0P:(DE-HGF)0$$aBoulle, Olivier$$b3
000902149 7001_ $$0P:(DE-Juel1)144926$$aKovács, András$$b4$$ufzj
000902149 7001_ $$0P:(DE-Juel1)144121$$aDunin-Borkowski, Rafal E.$$b5$$ufzj
000902149 773__ $$0PERI:(DE-600)1481716-0$$a10.1017/S1431927621012927$$gp. 1 - 10$$n6$$p1356-1365$$tMicroscopy and microanalysis$$v27$$x1435-8115$$y2021
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