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Structure and Magnetic Properties of Hot Pressed NiFe Powder

100%
Olekšáková D., Kollář P., Fűzer J., Kusý M.
Acta Physica Polonica A
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2008
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vol. 113
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issue 1
75-78
EN
The aim of this work is to investigate the structure and magnetic properties of compacted microcrystalline NiFe (81 wt. % of Ni) powder. Bulk samples were prepared by compaction of milled NiFe (81 wt. % of Ni) ribbon. We found that after compaction of the powder displacement of domain walls becomes more dominant and the coercivity decreases and is comparable with the coercivity of conventional permalloy. The coercivity of the bulk material before heat treatment is lower than that for powder and that is why we can assume that the magnetic "contact" is restored after compaction. Annealing of bulk samples reduces the losses due to the relaxation of internal stresses induced by milling and compaction.
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The Soft Magnetic Properties and Temperature Stability of Co-Fe-Zr-B Metallic Glasses

76%
Bednarčík J., Kováč J., Roth S., Fűzer J., Kollár P., Varga L., Franz H.
Acta Physica Polonica A
|
2008
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vol. 113
|
issue 1
83-86
EN
In the present work multicomponent Co-based alloys with nominal composition Co_{72-x}Fe_xZr_8B_{20} (x=10, 15, and 20 at. %) were synthesized by single-roller melt-spinning. The measurement of coercivity, H_c, reveals the soft magnetic behavior of investigated alloys. The value of H_c increases from 23 A/m for alloy with x=10 at. % up to 32 A/m for alloy with x=20 at. %. Further it was found that crystallization temperature of as-quenched alloys slightly varies with iron content and lays between 605 and 625°C. From the temperature dependence of magnetization it follows that partial substitution of cobalt by iron has positive influence on the Curie temperature of amorphous phase, T^{am}_c, which increases from 300°C up to 462°C for alloy with x=10 at. % and x=2 0 at. %, respectively.
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