Effect of Ni Substitution on the Structural, Magnetic, and Electronic Structure Properties of Gd 0.4 Tb 0.6 (Co 1-x Ni x ) 2 Compounds

The comprehensive research of magnetic and electronic structure properties of the new class of Gd Tb (Co Ni ) compounds, crystallizing in the cubic Laves phase (C15), is reported. The magnetic study was completed with electrical resistivity and electronic structure investigations. The analysis of Ar...

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Bibliographic Details
Published in:International journal of molecular sciences 2022-10, Vol.23 (21)
Main Authors: Sikora, Marcin, Bajorek, Anna, Chrobak, Artur, Deniszczyk, Józef, Ziółkowski, Grzegorz, Chełkowska, Grażyna
Format: Article
Language:English
Subjects:
Electronics
Magnetic Phenomena
Magnetics
Models, Molecular
Transition Elements - chemistry
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Summary:The comprehensive research of magnetic and electronic structure properties of the new class of Gd Tb (Co Ni ) compounds, crystallizing in the cubic Laves phase (C15), is reported. The magnetic study was completed with electrical resistivity and electronic structure investigations. The analysis of Arrott plots supplemented by a study of temperature dependency of Landau coefficients revealed that all compounds undergo a magnetic phase transition of the second type. Based on magnetic isotherms, magnetic entropy change ( ) was determined for many values of the magnetic field change ( ), which varied from 0.1 to 7 T. For each compound, the had a maximum around the Curie temperature. Both values of the | | and relative cooling power parameters increased with increasing nickel content. It is shown that structural disorder upon Co/Ni substitution influences some magnetic parameters. The magnetic moment values of Co atoms determined from different methods are quantitatively consistent. From the ( ) dependency, the exchange integrals J , J , and J between rare-earths (R) and transition metal (T) moments were evaluated within the mean-field theory (MFT) approach. The experimental study of the electronic structure performed with the use of the X-ray photoelectron spectroscopy (XPS) was completed by calculations using the full-potential linearized augmented plane waves (FP-LAPW) method based on the density functional theory (DFT). The calculations explained experimentally observed changes in the XPS valence band spectra upon the Ni/Co substitution.
ISSN:1422-0067
DOI:10.3390/ijms232113182