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Deconvolution of X-ray natural and magnetic circular dichroism in chiral Dy-ferroborate

Journal Article · · Scientific Reports
 [1];  [2];  [3];  [1];  [1];  [4]
  1. Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
  2. Pohang Univ. of Science and Technology (POSTECH) (Korea, Republic of)
  3. Univ. Grenoble (France); Centre National de la Recherche Scientifique (CNRS), Grenoble (France). Institut Néel
  4. Pohang Univ. of Science and Technology (POSTECH) (Korea, Republic of); Rutgers Univ., Piscataway, NJ (United States)
Structural chirality and magnetism, when intertwined, can have profound implications on materials properties. Using X-ray imaging and spectroscopic measurements that leverage the natural and magnetic circular dichroic effects present in magnetized chiral crystal structures, we probe the interplay between chirality and magnetism across the field-induced spin-flop transition of Dy ferroborate, DyFe3 (BO3)4. Deconvolution of natural and magnetic circular dichroic signals at the Fe K and Dy L2,3 absorption edges of the non-centrosymmetric structure was enabled by use of tunable temperature and magnetic field, providing access to element-specific magnetic information across the spin-flop transition. The magnetic response of Fe and Dy sublattices was found to be independent of domain chirality. The chiral domains were robust against both the (chirality preserving) R32 to P31 21/P32 21 structural phase transition at 280 K, and application of magnetic field up to 4 Tesla. A third flavor of X-ray dichroism, magneto-chiral dichroism, was not detected within the accuracy of our measurements. The absence of significant Fe magnetization along the screw, c-axis for the magnetic field strength used in this study, together with non-linear coupling of magnetic field to electric polarization across the spin-flop transition, may hinder observation of magneto-chiral dichroic effects in this system.
Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
National Research Foundation of Korea (NRF); USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
2574422
Journal Information:
Scientific Reports, Journal Name: Scientific Reports Journal Issue: 1 Vol. 14; ISSN 2045-2322
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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