Authors
Cristina Bartha, Claudiu Locovei, Andrei Alexandru-Dinu, Cezar Comanescu, Mihai Alexandru Grigoroscuta, Andrei Kuncser, Nicusor Iacob, Magda Galatanu, Aurel Leca, Petre Badica, Victor Kuncser
Published in
Physical chemistry chemical physics : PCCP. Oct 16, 2025. Epub Oct 16, 2025.
Abstract
The precise control of the magnetic compensation temperature (θc) in ferrimagnetic garnets is essential for the development of cutting-edge ultrafast customizable spintronic devices. In this work we demonstrate how fine variation in stoichiometry and cation distribution in iron gadolinium garnets significanty influences θc. Two samples of Gd3Fe5O112 garnets synthesized via a new hydrothermal method and a conventional solid-state reaction, respectively, were considered. The complex study was carried out using a complex approach combining X-ray diffraction, magnetometry, and Mössbauer spectroscopy. Atomic-scale analysis revealed with unprecedent accuracy a cationic inversion between Fe3+ ang Gd3+ at octahedral and dodecahedral sites in both samples, and their chemical compositions were determined as Gd2.70Fe4.76O11.9 and Gd2.96Fe4.68O11.5, respectively. These local rearrangements have been shown to have a consistent influence on θc (290 K and 317 K, respectively) around room temperature, emphasizing the high sensitivity of exchange interactions to internal atomic order. Results clearly illustrate the strong correlation between the processing, atomic configuration and macroscopic magnetic behavior, establishing a new paradigm for the design of garnet-based materials with tunable θc. The strategy for the accurate determination of cation inversion illustrated in this work exhibits great potential in guiding material innovations for next-generation spintronics.
PMID:
41099085
Bibliographic data and abstract were imported from PubMed on 16 Oct 2025.
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