Study of the Influence of Ferromagnetic Impurity Concentration on Magnetic Properties of Binary Palladium–Cobalt Alloy

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Abstract

A comparative study of the magnetic properties of a palladium–cobalt alloy with an impurity content of up to 0.05 at. % was made using calculations based on the density functional theory and experimental methods. It was found that the alloys had ferromagnetic ordering, which depended on the impurity concentration. At very low concentrations, less than 1 at. %, the magnetic moment per impurity atom can reach 25 µB.

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About the authors

I. I. Gumarova

Kazan Federal University

Author for correspondence.
Email: iipiyanzina@kpfu.ru
Russian Federation, Kazan

A. I. Gumarov

Kazan Federal University

Email: iipiyanzina@kpfu.ru
Russian Federation, Kazan

I. V. Yanilkin

Kazan Federal University

Email: iipiyanzina@kpfu.ru
Russian Federation, Kazan

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2. Fig. 1. View of the cell used in the modelling. There is one cobalt atom per 107 palladium atoms (the number of impurity atoms was increased to simulate a higher concentration). The ferromagnetic impurity polarises the matrix atoms in the vicinity. Palladium atoms with the highest magnetic moments are marked in the figure

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3. Fig. 2. Dependences of the experimental magnetisation (1) and the induced magnetic moment per cobalt atom on the Co impurity concentration: DFT calculation (2); experiment (3)

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4. Fig. 3. Dependences of the induced magnetic moment on palladium atoms (average (1) and maximum (2) values) and of the average magnetic moment on cobalt atoms (3) obtained by DFT calculations as a function of the concentration of ferromagnetic impurity cobalt

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5. Fig. 4. Dependence on the ferromagnetic impurity concentration obtained by DFT calculations: magnetic moment per impurity atom in the palladium-cobalt system (1); average magnetic moment on the cobalt atom (2)

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