Magnetic and structural characterization of Mo-Hitperm alloys with different Fe/Co ratio

Conde, C.F.; Borrego, J.M.; Blázquez, J.S.; Conde, A.; Švec, P.; Janičkovič, D.

doi:10.1016/j.jallcom.2010.10.113

Cited by 19 publications

(8 citation statements)

References 27 publications

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“…Up to recent, most of the successfully developed Fe-based nano-crystalline alloys have their composition formula as FeXMCu, [7][8][9][10][11][12][13] in which M represents one or more metalloids such as Si and B, and X represents early transition metals (ETM) such as Mo, [7][8][9] Nb, [10][11][12][13] Zr, 14 and so on. The strategy is to promote the nucleation of a-Fe by the addition of Cu 12 and inhibit the grain growth during the annealing process by the addition of the ETMs.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the crystallization mechanism difference between FINEMET® and NANOMET® type Fe-based soft magnetic amorphous alloys

Wang

Zhang

Takeuchi

et al. 2016

Journal of Applied Physics

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In this article, the atomic behaviors of Nb and P in Fe-based amorphous alloys during nano-crystallization process were studied by the combination of ab initio molecular dynamics simulations and experimental measurements. The inclusion of Nb is found to be tightly bonded with B, resulting in the formation of diffusion barrier that could prevent the over-growth of α-(Fe, Si) grains and the promotion of larger amount of α-(Fe, Si) participation. The P inclusion could delay the diffusion of the metalloids that have to be expelled from the α-(Fe, Si) crystallization region so that the grain growth could be reduced with fast but practically achievable heating rates. The combined addition of P and Nb in high Fe content amorphous alloys failed in exhibiting the potential of good magnetic softness with slow heating (10 K/min) annealing at various temperatures. The sample with optimum crystallization process with confined grain size was annealed at 653 K, with the grain size of 31 nm and a coercivity of ∼120 A/m, much too large to meet the application requirements and to be compared with the currently well-studied alloy systems. This attempt suggests that the inclusion of early transition metal elements might not be effective enough to suppress grain growth in crystallizing high Fe content amorphous alloys.

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Section: Introductionmentioning

confidence: 99%

Investigation on the crystallization mechanism difference between FINEMET® and NANOMET® type Fe-based soft magnetic amorphous alloys

Wang

Zhang

Takeuchi

et al. 2016

Journal of Applied Physics

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“…Nevertheless, all the hyperfine field distributions distinctly separate into two regions in Fig. 3(b) which suggests the coexistence of two distinguished zones in the amorphous structure of melt spun ribbons, namely the low field region (8 T to 15T) with weakened magnetic interactions and the high field region (15 T to 35 T) with enhanced magnetic interactions 28 . The low field region indicates Fe-deficient zones with plentiful B atoms and a little Cu atoms occupying in the neighbor shell of Fe atoms, while the high field region implies Fe enriched ones 29,30 .…”

Section: Resultsmentioning

confidence: 93%

Local structure, nucleation sites and crystallization behavior and their effects on magnetic properties of Fe81Si x B10P8−xCu1 (x = 0~8)

Cao

Wang

Zhu

et al. 2018

Sci Rep

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In this work, an attempt has been made to reveal critical factors dominating the crystallization and soft magnetic properties of Fe81SixB10P8−xCu1 (x = 0, 2, 4, 6 and 8) alloys. Both melt spun and annealed alloys are characterized by differential scanning calorimetry, X-ray diffractometry, Mössbauer spectroscopy, transmission electron microscopy, positron annihilation lifetime spectroscopy and magnetometry. The changes in magnetic interaction between Fe atoms and chemical homogeneity can well explain the variation of magnetic properties of Fe81SixB10P8−xCu1 amorphous alloys. The density of nucleation sites in the amorphous precursors decreases in the substitution of P by Si. Meanwhile, the precipitated nanograins gradually coarsen, but the inhibiting effect of P on grain growth diminishes causing the increase of the crystallinity. Moreover, various site occupancies of Si are observed in the nanocrystallites and the Si occupancy in bcc Fe decreases the average magnetic moment of nanograins. Without sacrificing amorphous forming ability, we can obtain FeSiBPCu nanocrystalline alloy with excellent soft magnetic properties by optimizing the content of Si and P in the amorphous precursors.

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“…Partial substitution of Fe by Co [3] leads to enhancement of the Curie temperature, and consequently improves thermal stability of ferromagnetic state in these alloys.…”

Section: Introductionmentioning

confidence: 99%

Influence of Co Doping on Induced Anisotropy and Domain Structure in Magnetic Field Annealed (Fe_{1-x}Co_x)_{79}Mo_8Cu_1B_{12}

et al. 2017

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The effect of heat treatment in applied magnetic field on the induced anisotropy and domain structure of (Fe1−xCox)79Mo8Cu1B12 (x = 0, 0.2, 0.5) nanocrystalline alloy system was investigated. A heat treatment of Codoped samples under the application of longitudinal magnetic field resulted in squared hysteresis loops characterized by very low coercive field values. Sheared loops with tunable slope and good field linearity were obtained after annealing in transverse magnetic field. Corresponding domain structure showed uniform character, oriented in the direction parallel or perpendicular to the ribbon axis after longitudinal or transverse magnetic field annealing, respectively. No effect of magnetic field annealing was found in Co-free sample. Correlations between Co-doping, the Curie temperature, and soft magnetic properties after magnetic field annealing are discussed.

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Magnetic and structural characterization of Mo-Hitperm alloys with different Fe/Co ratio

Cited by 19 publications

References 27 publications

Investigation on the crystallization mechanism difference between FINEMET® and NANOMET® type Fe-based soft magnetic amorphous alloys

Investigation on the crystallization mechanism difference between FINEMET® and NANOMET® type Fe-based soft magnetic amorphous alloys

Local structure, nucleation sites and crystallization behavior and their effects on magnetic properties of Fe81Si x B10P8−xCu1 (x = 0~8)

Influence of Co Doping on Induced Anisotropy and Domain Structure in Magnetic Field Annealed (Fe_{1-x}Co_x)_{79}Mo_8Cu_1B_{12}

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