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000888820 1001_ $$0P:(DE-HGF)0$$aPierobon, Leonardo$$b0$$eCorresponding author
000888820 245__ $$aUnconventional magnetization textures and domain-wall pinning in Sm–Co magnets
000888820 260__ $$a[London]$$bMacmillan Publishers Limited, part of Springer Nature$$c2020
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000888820 520__ $$aSome of the best-performing high-temperature magnets are Sm–Co-based alloys with a microstructure that comprises an Sm2Co17 matrix and magnetically hard SmCo5 cell walls. This generates a dense domain-wall-pinning network that endows the material with remarkable magnetic hardness. A precise understanding of the coupling between magnetism and microstructure is essential for enhancing the performance of Sm–Co magnets, but experiments and theory have not yet converged to a unified model. Here, transmission electron microscopy, atom probe tomography, and nanometer-resolution off-axis electron holography have been combined with micromagnetic simulations to reveal that the magnetization state in Sm–Co magnets results from curling instabilities and domain-wall pinning effects at the intersections of phases with different magnetic hardness. Additionally, this study has found that topologically non-trivial magnetic domains separated by a complex network of domain walls play a key role in the magnetic state by acting as nucleation sites for magnetization reversal. These findings reveal previously hidden aspects of magnetism in Sm–Co magnets and, by identifying weak points in the microstructure, provide guidelines for improving these high-performance magnetic materials.
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000888820 536__ $$0G:(EU-Grant)856538$$a3D MAGiC - Three-dimensional magnetization textures: Discovery and control on the nanoscale (856538)$$c856538$$fERC-2019-SyG$$x1
000888820 536__ $$0G:(EU-Grant)823717$$aESTEEM3 - Enabling Science and Technology through European Electron Microscopy (823717)$$c823717$$fH2020-INFRAIA-2018-1$$x2
000888820 536__ $$0G:(GEPRIS)405553726$$aDFG project 405553726 - TRR 270: Hysterese-Design magnetischer Materialien für effiziente Energieumwandlung (405553726)$$c405553726$$x3
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000888820 7001_ $$0P:(DE-Juel1)144926$$aKovács, András$$b1$$ufzj
000888820 7001_ $$0P:(DE-HGF)0$$aSchäublin, Robin E.$$b2
000888820 7001_ $$0P:(DE-HGF)0$$aGerstl, Stephan S. A.$$b3
000888820 7001_ $$0P:(DE-Juel1)157760$$aCaron, Jan$$b4$$ufzj
000888820 7001_ $$0P:(DE-HGF)0$$aWyss, Urs V.$$b5
000888820 7001_ $$0P:(DE-Juel1)144121$$aDunin-Borkowski, Rafal E.$$b6$$ufzj
000888820 7001_ $$0P:(DE-HGF)0$$aLöffler, Jörg F.$$b7$$eCorresponding author
000888820 7001_ $$0P:(DE-HGF)0$$aCharilaou, Michalis$$b8$$eCorresponding author
000888820 773__ $$0PERI:(DE-600)2615211-3$$a10.1038/s41598-020-78010-0$$gVol. 10, no. 1, p. 21209$$n1$$p21209$$tScientific reports$$v10$$x2045-2322$$y2020
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