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Magnetic Properties of Bulk and Thin Nd₂Fe₁₄B Films after Corrosion Action

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Constantin V., Neacşu E., Popescu A., Galyas A., Demidenko O., Yanushkevich K.
Acta Physica Polonica A
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2015
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vol. 127
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issue 2
368-370
EN
The corrosion action for bulk and thin Nd₂Fe₁₄B films magnets in different corrosion media was studied. The thin Nd-Fe-B films of 100 nm ≤ d ≤ 1000 nm were deposited on glass substrate by "flash" evaporation method. The structure and microstructure of the samples were studied by X-ray diffraction analysis, scanning electron microscopy. The temperature dependence of the magnetization before and after corrosion action was carried out by ponderomotive method in the temperature range 80 ≤ T ≤ 800 K. It is shown that the specific magnetizations of the thin Nd-Fe-B films with d ≥ 1000 nm are comparable to those measured for the powder samples. The values of the coercive and saturation fields were determined from the hysteresis loops measurements.
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Crystal Structure and Magnetic Properties of Mn_{1-x}Gd_{x}Se Solid Solutions

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Aplesnin S., Galyas A., Demidenko O., Makovetskii G., Panasevich A., Yanushkevich K.
Acta Physica Polonica A
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2015
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vol. 127
|
issue 2
371-373
EN
The synthesis of polycrystalline Mn_{1-x}Gd_{x}Se solid solutions is carried out by solid state reaction method followed by quenching from the temperature of 1370 K. The X-ray diffraction studies realized at 300 K revealed that the structure of the single phase samples in the 0 < x < 0.15 concentration range is identified on base a face centered cubic crystal cell of Fm3m space group. The heating of the solid solutions to 900 K does not affect on the magnetic susceptibility as the dependences is identical to the measurements in the "heating-cooling" regime. Comparing the research results of magnetic properties of the Mn_{1-x}Gd_{x}Se solid solutions with those of Mn_{1-x}Gd_{x}S solid solutions, we can conclude that substitution of manganese ions by gadolinium in manganese selenide lead to more changes in the basic magnetic characteristics than in manganese sulfide.
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