Ultra-soft ferrimagnetism in a high-entropy spinel oxide driven by site-selective cation disorder
Abstract
High-entropy materials are complex, multifunctional materials that have reshaped the design of advanced functional materials. Their chemically diverse compositions enable access to a broader compositional space than conventional solid solutions, while simultaneously posing significant challenges for fundamental structureproperty understanding. In this study, we introduce a new highentropy spinel oxide with an exceptionally low coercivity of 1.8 Oe at room temperature, among the lowest reported for bulk spinel oxides, and a high electrical resistivity (1560 ohm cm). Neutron powder diffraction (NPD) and magnetic measurements reveal longrange collinear ferrimagnetic ordering (k = 0, 0, 0) with a transition temperature at 420 K. This rare combination of ultra-soft magnetic behavior, robust ferrimagnetic ordering well above room temperature, and high resistivity highlights its strong potential as an advanced soft-magnetic oxide for low-loss, high-frequency applications. Furthermore, X-ray absorption spectroscopy (XAS), Mo ¨ssbauer spectroscopy, and NPD analyses were combined to determine the cation distribution and site selectivity across the tetrahedral and octahedral sites of the complex structure.
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BibTeX
@article{sharma2026ultrasoft,
title = {{Ultra-soft ferrimagnetism in a high-entropy spinel oxide driven by site-selective cation disorder}},
author = {Neha Sharma and Amritpal Amritpal and Nikita Sharma and Mathieu Duttine and Denis Pelloquin and Som Datta Kaushik and Sanjoy Mahatha and Olivier Toulemonde and Sourav Marik},
journal = {Materials Horizons},
year = {2026},
month = oct,
doi = {10.1039/d6mh00508j},
url = {https://u-bordeaux.hal.science/hal-05788557v1},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Ultra-soft ferrimagnetism in a high-entropy spinel oxide driven by site-selective cation disorder
AU - Neha Sharma
AU - Amritpal Amritpal
AU - Nikita Sharma
AU - Mathieu Duttine
AU - Denis Pelloquin
AU - Som Datta Kaushik
AU - Sanjoy Mahatha
AU - Olivier Toulemonde
AU - Sourav Marik
PY - 2026
DA - 2026/10/09
JO - Materials Horizons
DO - 10.1039/d6mh00508j
UR - https://u-bordeaux.hal.science/hal-05788557v1
AB - High-entropy materials are complex, multifunctional materials that have reshaped the design of advanced functional materials. Their chemically diverse compositions enable access to a broader compositional space than conventional solid solutions, while simultaneously posing significant challenges for fundamental structureproperty understanding. In this study, we introduce a new highentropy spinel oxide with an exceptionally low coercivity of 1.8 Oe at room temperature, among the lowest reported for bulk spinel oxides, and a high electrical resistivity (1560 ohm cm). Neutron powder diffraction (NPD) and magnetic measurements reveal longrange collinear ferrimagnetic ordering (k = 0, 0, 0) with a transition temperature at 420 K. This rare combination of ultra-soft magnetic behavior, robust ferrimagnetic ordering well above room temperature, and high resistivity highlights its strong potential as an advanced soft-magnetic oxide for low-loss, high-frequency applications. Furthermore, X-ray absorption spectroscopy (XAS), Mo ¨ssbauer spectroscopy, and NPD analyses were combined to determine the cation distribution and site selectivity across the tetrahedral and octahedral sites of the complex structure.
SN - 2051-6347
ER -