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Influence of Additions and Stratification on the Magnetic Properties and Out-of-Plane Texture of Nd-Fe-B Films

100%
Grigoras M., Lupu N., Chiriac H., Borza F., Urse M.
Acta Physica Polonica A
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2014
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vol. 126
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issue 1
220-221
EN
Nd-Fe-B films with Ta and Mo additions used as buffer and capping layers and as interlayers have been deposited by r.f. sputtering on heated Si(111) substrates at 370°C and 470°C, and subsequently annealed at temperatures between 550°C and 650°C. In comparison with the Ta/NdFeB/Ta film, the Mo/NdFeB/Mo film deposited at 470°C presents an obvious anisotropic character. Very good anisotropic magnetic properties were obtained for Mo/[NdFeB(180)/Mo(5)]×3/Mo multilayer film deposited at 470°C and then annealed at 550°C. This sample exhibits an increase in coercivity from 1225 kA/m up to 1651.8 kA/m, increase in M_{r}/M_{s} ratio from 0.90 up to 0.99, and increase in the maximum energy product from 60.4 to 121.6 kJ/m^{3} as compared to the as-deposited Mo/NdFeB/Mo film. The results demonstrate that after annealing at 550°C the Mo film is more effective for nucleation of Nd_{2}Fe_{14}B hard magnetic grains with c-axis perpendicular to the film plane, especially in multilayer variant.
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Comparison between Powders of Strontium Hexaferrite Processed by Dynamic Gas Heat Treatment and Re-Calcination

86%
Tudorache F., Brinza F., Popa P., Petrila I., Grigoras M., Tascu S.
Acta Physica Polonica A
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2012
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vol. 121
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issue 1
92-94
EN
The utilization of classical ceramic technology for ferrite preparation permits to obtain strontium hexaferrite with big crystals, of micrometer size, with a smaller coercive force than the hexaferrite with submicron crystals. In this work the strontium hexaferrite was obtained with submicron crystals, by hot reduction of the hexaferrite obtained through ceramic technology in CO atmosphere, followed by the thermal re-oxidization in air. The effects of treatment in CO atmosphere and of the re-calcination treatment on the magnetic and electric properties of the strontium hexaferrite were investigated.
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