The interplay of selective occupation and magnetic properties of high entropy spinel oxides
Abstract
We investigate the interplay between the selective occupation (cationic site and valence preferences) and magnetic properties of three high entropy spinel oxides (HESOs). One of the samples ((Co,Cr,Fe,Mn,Ni)3O4 ) is well known in the literature, while the other two HESOs ((Co,Fe,Mn)3O4 , (Co,Fe,Mn,Ni)3O4 ) are unstudied. XAS and RIXS of the transition metal L-edge, and ligand field theory (LFT) calculations were also used to determine the selective occupation. We found that nickel and chromium assume exclusively Oh2+ and Oh3+ sites, respectively. Iron undergoes a transition from Oh3+ to Td3+ d with increasing entropy. Manganese and cobalt adapt according to the remaining cations. The determined selective occupation can accurately predict the trend of the saturation magnetic moment µsat. The decrease in µsat correlates with the transition of iron cations. Gaining a more extensive understanding of how the selective occupation is directed, and what implications this has on the structural, electronic, and magnetic properties, will lead the way to tailoring HESOs to individual applications.
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BibTeX
@article{meier2026interplay,
title = {{The interplay of selective occupation and magnetic properties of high entropy spinel oxides}},
author = {Carl Magnus Meier and Teak D. Boyko and Dharma Teja Teppala and Peter Ufondu and Emanuel Ionescu and Alexander Moewes},
journal = {Journal of Alloys and Compounds},
year = {2026},
month = oct,
doi = {10.1016/j.jallcom.2025.181224},
url = {https://hal.science/hal-05789874v1},
note = {CC BY-NC},
}
RIS
TY - JOUR
TI - The interplay of selective occupation and magnetic properties of high entropy spinel oxides
AU - Carl Magnus Meier
AU - Teak D. Boyko
AU - Dharma Teja Teppala
AU - Peter Ufondu
AU - Emanuel Ionescu
AU - Alexander Moewes
PY - 2026
DA - 2026/10/09
JO - Journal of Alloys and Compounds
DO - 10.1016/j.jallcom.2025.181224
UR - https://hal.science/hal-05789874v1
AB - We investigate the interplay between the selective occupation (cationic site and valence preferences) and magnetic properties of three high entropy spinel oxides (HESOs). One of the samples ((Co,Cr,Fe,Mn,Ni)3O4 ) is well known in the literature, while the other two HESOs ((Co,Fe,Mn)3O4 , (Co,Fe,Mn,Ni)3O4 ) are unstudied. XAS and RIXS of the transition metal L-edge, and ligand field theory (LFT) calculations were also used to determine the selective occupation. We found that nickel and chromium assume exclusively Oh2+ and Oh3+ sites, respectively. Iron undergoes a transition from Oh3+ to Td3+ d with increasing entropy. Manganese and cobalt adapt according to the remaining cations. The determined selective occupation can accurately predict the trend of the saturation magnetic moment µsat. The decrease in µsat correlates with the transition of iron cations. Gaining a more extensive understanding of how the selective occupation is directed, and what implications this has on the structural, electronic, and magnetic properties, will lead the way to tailoring HESOs to individual applications.
SN - 0925-8388
ER -