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Instruments / Technical Area	Publication Details	Published	Actions
B18-Core EXAFS	Role of crystal and magnetic structures in the magnetoelectric coupling in CaMn7O12 Jhuma Sannigrahi , Md Salman Khan , Mohamad Numan , Manjil Das , Anupam Banerjee , Manh Duc Le , Giannantonio Cibin , Devashibhai Adroja , Subham Majumdar Physical Review B 109 DOI: 10.1103/PhysRevB.109.054417 Diamond Proposal Number(s): [17752] Open Access Show Abstract ▼ Abstract: We investigate the magnetoelectric coupling in CaMn 7 O 12 (CMO) through a comprehensive spectroscopic analysis combining inelastic neutron scattering (INS), x-ray absorption spectroscopy (XAS), and synchrotron-based powder x-ray diffraction (PXRD). CMO's intricate interplay between magnetism and ferroelectricity is dissected to uncover its underlying mechanisms. XAS reveals a mixed valency of Mn ions in CMO, reflecting the presence of Mn 3 + and Mn 4 + ions, which contributes to its magnetoelectric properties. The double structure in Mn- K near-edge absorption spectra reinforces multiple Mn sites as well as the mixed valency of the compound. Synchrotron-based PXRD experiments conducted over a range of temperatures unveil structural distortions near the magnetic transition temperatures of CMO. These distortions coincide with anomalies in lattice parameters and bond lengths, shedding light on the link between structural modulations and magnetoelectric behavior. Furthermore, INS measurements identify specific energy bands ( E 1 , E 2 , and E 3 ) associated with distinct exchange interactions between Mn ions. This work advances our understanding of magnetoelectric coupling mechanisms and showcases the potential of multifunctional materials for applications in spintronics and related fields.	Feb 2024

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B18-Core EXAFS

Role of crystal and magnetic structures in the magnetoelectric coupling in CaMn7O12

Jhuma Sannigrahi , Md Salman Khan , Mohamad Numan , Manjil Das , Anupam Banerjee , Manh Duc Le , Giannantonio Cibin , Devashibhai Adroja , Subham Majumdar

Physical Review B 109

DOI: 10.1103/PhysRevB.109.054417

Diamond Proposal Number(s): [17752]