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• W3143608754 abstract "Polarized 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.Received 9 June 2020Revised 29 November 2020Accepted 14 January 2021DOI:https://doi.org/10.1103/PhysRevX.11.011060Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.Published by the American Physical SocietyPhysics Subject Headings (PhySH)Research AreasAntiferromagnetismDzyaloshinskii-Moriya interactionMagnetic domainsPhysical SystemsAntiferromagnetsSingle crystal materialsTechniquesDensity functional calculationsNeutron diffractionCondensed Matter, Materials & Applied Physics" @default.
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• W3143608754 date "2021-03-25" @default.
• W3143608754 modified "2023-09-25" @default.
• W3143608754 title "Revealing the Absolute Direction of the Dzyaloshinskii-Moriya Interaction in Prototypical Weak Ferromagnets by Polarized Neutrons" @default.
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• W3143608754 doi "https://doi.org/10.1103/physrevx.11.011060" @default.
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