Influence of composition and thermal treatments on structural, magnetic and magnetotransport properties of (Fe100-xCox) 78Si9Nb3B9Cu1 alloys

S. N. Kane, Zs Gercsi, F. Mazaleyrat, L. Varga, M. Coisson, P. Tiberto, F. Vinai, F. Celegato, Y. H. Jeong

Research output: Contribution to journalArticle

Abstract

The effect of Co addition and thermal treatments on the magnetic properties and the correspond-ing changes occurring in the nanostructure and magnetoimpedance in (Fe100-xCox)78Si 9Nb3B9Cu1 with x = 0, 20, 40, 60, 70, 75, 80, 85, 90, 95 are reported. Results show that variation in the Co content affects the stability of the alloy against crystallization and that the specimen with x = 40 exhibits highest stability against crystallization. The volume fraction of the nanograins varies between 42 to 62 % and the corresponding grain diameter ranges between 9 to 13 nm. Obtained lattice parameter values suggest that the studied samples consist of bcc Co-Fe phase with Si impurities, with Co contents ranging between 50 to 74 % and Si contents ranging between 7 to 25 %. In the studied alloys, especially above x = 70, there is a tendency to form and to stabilize a Co70Fe30-like phase. The coercive force for as-cast specimens practically does not change with increasing Co content whereas the samples annealed with and without a magnetic field exhibit appreciable changes and display similar behaviours. The coercive field is systematically lower for field-annealed samples and the abrupt increase in the coercive field for alloys with x = 70 and above is attributed to the formation of a magnetically harder Co70Fe30-like phase (as compared to the Fe80Si20 phase), which were confirmed by a decrease in the lattice parameter. The maximum values of the obtained induced anisotropy constant and the anisotropy field are, respectively, 750 J/m 3 and ∼ 1250 A/m. The magnetoimpedance maximum response of the studied samples remains almost constant as a function of Co concentration for the three kinds of samples (as-cast and annealed with and without a field). However, a threefold increase in the linear range is observed for the transverse-field-annealed samples, which should increase the dynamic range of field sensors based on these new materials.

Original languageEnglish
Pages (from-to)3634-3639
Number of pages6
JournalJournal of the Korean Physical Society
Volume53
Issue number6 PART 1
Publication statusPublished - Dec 2008

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magnetic properties
casts
lattice parameters
crystallization
anisotropy
dynamic range
tendencies
impurities
sensors
magnetic fields

Keywords

  • Hysteresis measurements
  • Magnetic anisotropy
  • Magnetic-field annealing
  • Magnetoimpedance

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Influence of composition and thermal treatments on structural, magnetic and magnetotransport properties of (Fe100-xCox) 78Si9Nb3B9Cu1 alloys. / Kane, S. N.; Gercsi, Zs; Mazaleyrat, F.; Varga, L.; Coisson, M.; Tiberto, P.; Vinai, F.; Celegato, F.; Jeong, Y. H.

In: Journal of the Korean Physical Society, Vol. 53, No. 6 PART 1, 12.2008, p. 3634-3639.

Research output: Contribution to journalArticle

Kane, SN, Gercsi, Z, Mazaleyrat, F, Varga, L, Coisson, M, Tiberto, P, Vinai, F, Celegato, F & Jeong, YH 2008, 'Influence of composition and thermal treatments on structural, magnetic and magnetotransport properties of (Fe100-xCox) 78Si9Nb3B9Cu1 alloys', Journal of the Korean Physical Society, vol. 53, no. 6 PART 1, pp. 3634-3639.
Kane, S. N. ; Gercsi, Zs ; Mazaleyrat, F. ; Varga, L. ; Coisson, M. ; Tiberto, P. ; Vinai, F. ; Celegato, F. ; Jeong, Y. H. / Influence of composition and thermal treatments on structural, magnetic and magnetotransport properties of (Fe100-xCox) 78Si9Nb3B9Cu1 alloys. In: Journal of the Korean Physical Society. 2008 ; Vol. 53, No. 6 PART 1. pp. 3634-3639.
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abstract = "The effect of Co addition and thermal treatments on the magnetic properties and the correspond-ing changes occurring in the nanostructure and magnetoimpedance in (Fe100-xCox)78Si 9Nb3B9Cu1 with x = 0, 20, 40, 60, 70, 75, 80, 85, 90, 95 are reported. Results show that variation in the Co content affects the stability of the alloy against crystallization and that the specimen with x = 40 exhibits highest stability against crystallization. The volume fraction of the nanograins varies between 42 to 62 {\%} and the corresponding grain diameter ranges between 9 to 13 nm. Obtained lattice parameter values suggest that the studied samples consist of bcc Co-Fe phase with Si impurities, with Co contents ranging between 50 to 74 {\%} and Si contents ranging between 7 to 25 {\%}. In the studied alloys, especially above x = 70, there is a tendency to form and to stabilize a Co70Fe30-like phase. The coercive force for as-cast specimens practically does not change with increasing Co content whereas the samples annealed with and without a magnetic field exhibit appreciable changes and display similar behaviours. The coercive field is systematically lower for field-annealed samples and the abrupt increase in the coercive field for alloys with x = 70 and above is attributed to the formation of a magnetically harder Co70Fe30-like phase (as compared to the Fe80Si20 phase), which were confirmed by a decrease in the lattice parameter. The maximum values of the obtained induced anisotropy constant and the anisotropy field are, respectively, 750 J/m 3 and ∼ 1250 A/m. The magnetoimpedance maximum response of the studied samples remains almost constant as a function of Co concentration for the three kinds of samples (as-cast and annealed with and without a field). However, a threefold increase in the linear range is observed for the transverse-field-annealed samples, which should increase the dynamic range of field sensors based on these new materials.",
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T1 - Influence of composition and thermal treatments on structural, magnetic and magnetotransport properties of (Fe100-xCox) 78Si9Nb3B9Cu1 alloys

AU - Kane, S. N.

AU - Gercsi, Zs

AU - Mazaleyrat, F.

AU - Varga, L.

AU - Coisson, M.

AU - Tiberto, P.

AU - Vinai, F.

AU - Celegato, F.

AU - Jeong, Y. H.

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N2 - The effect of Co addition and thermal treatments on the magnetic properties and the correspond-ing changes occurring in the nanostructure and magnetoimpedance in (Fe100-xCox)78Si 9Nb3B9Cu1 with x = 0, 20, 40, 60, 70, 75, 80, 85, 90, 95 are reported. Results show that variation in the Co content affects the stability of the alloy against crystallization and that the specimen with x = 40 exhibits highest stability against crystallization. The volume fraction of the nanograins varies between 42 to 62 % and the corresponding grain diameter ranges between 9 to 13 nm. Obtained lattice parameter values suggest that the studied samples consist of bcc Co-Fe phase with Si impurities, with Co contents ranging between 50 to 74 % and Si contents ranging between 7 to 25 %. In the studied alloys, especially above x = 70, there is a tendency to form and to stabilize a Co70Fe30-like phase. The coercive force for as-cast specimens practically does not change with increasing Co content whereas the samples annealed with and without a magnetic field exhibit appreciable changes and display similar behaviours. The coercive field is systematically lower for field-annealed samples and the abrupt increase in the coercive field for alloys with x = 70 and above is attributed to the formation of a magnetically harder Co70Fe30-like phase (as compared to the Fe80Si20 phase), which were confirmed by a decrease in the lattice parameter. The maximum values of the obtained induced anisotropy constant and the anisotropy field are, respectively, 750 J/m 3 and ∼ 1250 A/m. The magnetoimpedance maximum response of the studied samples remains almost constant as a function of Co concentration for the three kinds of samples (as-cast and annealed with and without a field). However, a threefold increase in the linear range is observed for the transverse-field-annealed samples, which should increase the dynamic range of field sensors based on these new materials.

AB - The effect of Co addition and thermal treatments on the magnetic properties and the correspond-ing changes occurring in the nanostructure and magnetoimpedance in (Fe100-xCox)78Si 9Nb3B9Cu1 with x = 0, 20, 40, 60, 70, 75, 80, 85, 90, 95 are reported. Results show that variation in the Co content affects the stability of the alloy against crystallization and that the specimen with x = 40 exhibits highest stability against crystallization. The volume fraction of the nanograins varies between 42 to 62 % and the corresponding grain diameter ranges between 9 to 13 nm. Obtained lattice parameter values suggest that the studied samples consist of bcc Co-Fe phase with Si impurities, with Co contents ranging between 50 to 74 % and Si contents ranging between 7 to 25 %. In the studied alloys, especially above x = 70, there is a tendency to form and to stabilize a Co70Fe30-like phase. The coercive force for as-cast specimens practically does not change with increasing Co content whereas the samples annealed with and without a magnetic field exhibit appreciable changes and display similar behaviours. The coercive field is systematically lower for field-annealed samples and the abrupt increase in the coercive field for alloys with x = 70 and above is attributed to the formation of a magnetically harder Co70Fe30-like phase (as compared to the Fe80Si20 phase), which were confirmed by a decrease in the lattice parameter. The maximum values of the obtained induced anisotropy constant and the anisotropy field are, respectively, 750 J/m 3 and ∼ 1250 A/m. The magnetoimpedance maximum response of the studied samples remains almost constant as a function of Co concentration for the three kinds of samples (as-cast and annealed with and without a field). However, a threefold increase in the linear range is observed for the transverse-field-annealed samples, which should increase the dynamic range of field sensors based on these new materials.

KW - Hysteresis measurements

KW - Magnetic anisotropy

KW - Magnetic-field annealing

KW - Magnetoimpedance

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