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000891615 1001_ $$0P:(DE-Juel1)176326$$aThoma, H.$$b0$$eFirst author
000891615 245__ $$aRevealing the Absolute Direction of the Dzyaloshinskii-Moriya Interaction in Prototypical Weak Ferromagnets by Polarized Neutrons
000891615 260__ $$aCollege Park, Md.$$bAPS$$c2021
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000891615 520__ $$aPolarized neutron diffraction (PND) is a powerful technique to distinguish a weak magnetic contribution from the total scattering intensity. It can provide a detailed insight into the microscopic spin ordering at the unit cell level, but also into the mesoscopic magnetic ordering, like different types of domain populations. Here we report on the application of this technique to the long-standing problem of determining the absolute direction of the Dzyaloshinskii-Moriya vector in relation to the crystal structure. The proposed PND method, based on the measurement of one representative reflection, is easy to perform and straightforward to interpret. The absolute sign of the Dzyaloshinskii-Moriya interaction (DMI) in MnCO3 has been independently determined by PND and found to be in agreement with recent results obtained by resonant magnetic synchrotron scattering. This validates the method. In addition, the absolute DMI vector direction in the prototypical room-temperature weak ferromagnet α-Fe2O3 (hematite) has been determined for the first time. To demonstrate the generality of our method, further examples with different symmetries are also presented. Ab initio calculations of the resulting weak noncollinear magnetization using the quantum espresso package, considering DMI in addition to the symmetric magnetic exchange interaction, were also conducted and found to be in agreement with the experimental results from PND.
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000891615 693__ $$0EXP:(DE-MLZ)POLI-HEIDI-20140101$$1EXP:(DE-MLZ)FRMII-20140101$$5EXP:(DE-MLZ)POLI-HEIDI-20140101$$6EXP:(DE-MLZ)SR9a-20140101$$aForschungs-Neutronenquelle Heinz Maier-Leibnitz $$ePOLI: Polarized hot neutron diffractometer$$fSR9a$$x0
000891615 7001_ $$0P:(DE-Juel1)164298$$aHutanu, V.$$b1$$eCorresponding author
000891615 7001_ $$00000-0002-4668-241X$$aDeng, H.$$b2
000891615 7001_ $$0P:(DE-HGF)0$$aDmitrienko, V. E.$$b3
000891615 7001_ $$0P:(DE-HGF)0$$aBrown, P. J.$$b4
000891615 7001_ $$00000-0003-2763-468X$$aGukasov, A.$$b5
000891615 7001_ $$0P:(DE-HGF)0$$aRoth, G.$$b6
000891615 7001_ $$0P:(DE-Juel1)130504$$aAngst, M.$$b7$$eLast author
000891615 773__ $$0PERI:(DE-600)2622565-7$$a10.1103/PhysRevX.11.011060$$gVol. 11, no. 1, p. 011060$$n1$$p011060$$tPhysical review / X$$v11$$x2160-3308$$y2021
000891615 8564_ $$uhttps://juser.fz-juelich.de/record/891615/files/PhysRevX.11.011060.pdf$$yOpenAccess
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