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2026-10-01

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cc-by-nc-nd (c) Kibalin, Iurii et al., 2026
Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/231512

Revealing the spin structure, exchange constants and local anisotropy in nanoparticles with polarised neutron powder diffraction: Mn3O4 as case study

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https://doi.org/10.1016/j.mattod.2026.103448

Resum

The functional magnetic properties of nanostructured materials can be distinctly different from their bulk counterparts. Understanding these properties is crucial for basic material science and for applications using nanostructured magnetic materials. However, determining intrinsic magnetic structures, exchange constants and local magnetic anisotropy in nanoparticles poses considerable challenges. Here, polarised neutron powder diffraction (PNPD) data, analysed in the frame of the Local Susceptibility and Model Hamiltonian approaches, is used to gain information on the contribution of the different magnetic sublattices on the magnetisation process in Mn3O4 nanoparticles in unprecedented detail. The magnetic order is found to be a Yafet-Kittel-type canted structure with inter- and intra-sublattice antiferromagnetic couplings, similar to bulk. PNPD corroborates that the c-axis is the hard-axis and the individual contributions of each magnetic site to the easy-plane magnetic anisotropy are determined. Remarkably, the analysis of the PNPD data provides the foremost determination of the microscopic magnetic parameters in nanoparticles, namely, intra- and inter- sub-lattice exchange constants and the local anisotropy parameter. The obtained values are consistent with bulk Mn3O4 experimental and theoretical results. These results open the path for the use of PNPD to gain unique magnetic information in nanostructured materials, particularly in complex, novel, or poorly understood systems.

Matèries

Anisotropia, Difracció de neutrons, Propietats magnètiques, Nanopartícules

Matèries (anglès)

Anisotropy, Neutron diffraction, Magnetic properties, Nanoparticles

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Articles publicats en revistes (Química Inorgànica i Orgànica)
Articles publicats en revistes (Institut de Nanociència i Nanotecnologia (IN2UB))

Citació

KIBALIN, Iurii, et al. Revealing the spin structure, exchange constants and local anisotropy in nanoparticles with polarised neutron powder diffraction: Mn3O4 as case study. Materials Today. 2026. Vol. 99. ISSN 1369-7021. [consulted: 16 of September of 2026]. Available at: https://hdl.handle.net/2445/231512

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