Magnetic properties of fcc iron-nickel alloys at finite temperatures

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Abstract

For the disordered fcc alloy FexNi1−x, we study the dependence of the Curie temperature, average and local magnetic moments on the concentration x. We show how the dependence of the average and local magnetic moments on the concentration changes with temperature. The problem is considered in the renormalized Gaussian approximation of the dynamic spin-fluctuation theory. The numerical results are in good agreement with the experiment.

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About the authors

N. B. Melnikov

Lomonosov Moscow State University

Author for correspondence.
Email: melnikov@cs.msu.ru
Russian Federation, Moscow, 119991

B. I. Reser

Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences

Email: melnikov@cs.msu.ru
Russian Federation, Ekaterinburg, 620108

References

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Supplementary files

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2. Fig. 1. Slater-Poling curve for Fe, Co and Ni alloys. Experimental values are taken from [19], except for the HCC alloys Fe-Co [20] and Fe-Ni [4]. The values of mz at T = 0 used in the DTSF-PGA calculations are indicated by asterisks.

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3. Fig. 2. PES of d-electrons of the disordered HCC alloy FexNi1-x at 0.1 ≤ x ≤ 0.6, smoothed using convolution with a Lorentz half-width function of G = 0.001 W. The vertical dash indicates the Fermi level εF.

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4. Fig. 3. Magnetic moment (calculation -, experiment - - - - - - - [25]), rms fluctuations (- - - - -) and (- - - -) in units of mean field squared at T = 0, local magnetic moment (- - - - -) and inverse paramagnetic susceptibility χ-1 (- - - - -) in units of disordered HCC alloy FexNi1-x at iron concentrations of 0. 1 ≤ x ≤ 0.6, calculated in DTSF-PGA as functions of relative temperature .

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5. Fig. 4. Dependence of the Curie temperature TC for disordered HCC alloy FexNi1-x on nickel concentration 1 - x at 0.1 ≤ x ≤ 0.6 calculated in the dynamic nonlocal DTSF-PGA theory, in one-hole theories: static PCP approximation [27] and dynamic PCP+DTSP approximation [6] - and in experiment [3, 26].

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6. Fig. 5. Dependence of the Curie temperature TC on the average number of electrons per atom for Fe, Co and Ni alloys. Experimental values are taken from [26], except for Fe-Co [29] and Fe-Ni [4] HCC alloys. The TC values calculated in DTSF-PGA are marked with asterisks.

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7. Fig. 6. Dependence of the average magnetic moment mz for the disordered HCC alloy FexNi1-x on nickel concentration 1 - x at 0.1 ≤ x ≤ 0.6, calculated in DTSF-PGA at different temperatures.

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8. Fig. 7. Dependence of the local magnetic moment mL for the disordered HCC alloy FexNi1-x on the nickel concentration 1 - x at 0.1 ≤ x ≤ 0.6 calculated in DTSF-PGA at different temperatures. The inset shows larger values at nickel concentrations 1 - x = 0.7 and 1 - x = 0.8.

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