Role of crystal and magnetic structures in the magnetoelectric coupling in CaMn7 O12

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

doi:10.1103/PhysRevB.109.054417

Role of crystal and magnetic structures in the magnetoelectric coupling in CaMn7 O12

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

Physics

Research output: Contribution to journal › Article › peer-review

1 Citation (Scopus)

Abstract

We investigate the magnetoelectric coupling in CaMn7O12 (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 Mn3+ and Mn4+ 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 (E1, E2, and E3) 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.

Original language	English
Article number	054417
Journal	Physical Review B
Volume	109
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevB.109.054417
Publication status	Published - 1 Feb 2024

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.109.054417

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title = "Role of crystal and magnetic structures in the magnetoelectric coupling in CaMn7 O12",

abstract = "We investigate the magnetoelectric coupling in CaMn7O12 (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 Mn3+ and Mn4+ 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 (E1, E2, and E3) 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.",

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AU - Sannigrahi, Jhuma

AU - Khan, Md Salman

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AU - Banerjee, Anupam

AU - Le, Manh Duc

AU - Cibin, Giannantonio

AU - Adroja, Devashibhai

AU - Majumdar, Subham

N1 - Publisher Copyright: © 2024 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"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.

PY - 2024/2/1

Y1 - 2024/2/1

N2 - We investigate the magnetoelectric coupling in CaMn7O12 (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 Mn3+ and Mn4+ 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 (E1, E2, and E3) 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.

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Role of crystal and magnetic structures in the magnetoelectric coupling in CaMn7 O12

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