Mechanism Behind the Enhanced Ferromagnetic Contributions Upon Ru Substitution in Ca₃Mn₂O₇ from X-Ray Absorption Spectroscopies.

ABSTRACT: We have studied the local structure and electronic and magnetic properties of hybrid improper ferroelectric Ca₃Mn₂O₇ upon Ru substitution at the Mn site by a combination of atomic-selective X-ray absorption spectroscopies in the soft and hard X-ray energy regimes. Ru substitution enhances the macroscopic ferromagnetic contributions, whose origin is here elucidated. In particular, soft X-ray magnetic circular dichroism (XMCD) data indicate that the spin moments of Mn and Ru are aligned in opposite directions, with the effective magnetic moments of Ru being about 1 order of magnitude smaller than for Mn. The XMCD results also demonstrate the presence of an intrinsic ferromagnetic component in the Mn sublattice for Ru contents x ≥ 0.3, although the valu

SUBMITTER: Subias G 

PROVIDER: S-EPMC11465480 | biostudies-literature | 2024 Oct

REPOSITORIES: biostudies-literature