Nanostructure and magnetic properties of Ni-substituted finemet ribbons

Iturriza, N.; Fernández, Laura García; Ipatov, M.; Vara, G.; Pierna, A.R.; Val, J. J. del; Chizhik, A.; González, J.

doi:10.1016/j.jmmm.2007.02.209

Cited by 7 publications

(5 citation statements)

References 7 publications

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“…The magnetocrystalline anisotropy vanishes when the grain size is smaller than the ferromagnetic exchange length and magnetostriction approaches zero due to the cancellation of the positive magnetostriction of á Fe(Si) − crystallites and negative magnetostriction of the amorphous matrix. Effect of partial substitution of Fe with Co, 12,13 Al 14,15 Al-Ge, 16 Ni, 17 Cr-Mo 18 and Cr 19 have been investigated. It has been reported that the replacement of Fe by Cr enhances the thermal stability against crystallization and reduces the Curie temperature (T c ) of the amorphous phase.…”

Section: Introductionmentioning

confidence: 99%

Study of crystallization phases and magnetic properties of Fe72.5Cr1Nb3Cu1Si13.5B9 nanocrystalline alloy prepared by rapid quenching method

Mt¹

2020

MSEIJ

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Phase constitution and soft magnetic properties of nanocrystalline alloy of composition Fe 72.5 Cr 1 Nb 3 Cu 1 Si 13.5 B 9 prepared by single roller rapid quenching technique was investigated in this paper. The amorphous nature and the nanocrystal formation of the alloy was determined by X-ray diffraction (XRD) besides the crystallization kinetics was studied by Differential Thermal Analysis (DTA). The annealing temperature was maintained within the range 450 o C to 800 o C for 30minutes. DTA study reveals the existence of two exothermic peaks one for primary crystallization of á Fe(Si) −phase and other for secondary crystallization of Fe 2 B phase. The temperature difference between two crystallization peaks is found to exist ~170 o C. This large temperature gap is an indication of the enhancement of stability of á Fe(Si − phase against detrimental Fe 2 B phase. In the optimized annealing condition, the grain size has been obtained in the range of 10-15 nm. The saturation magnetization (M s ) has been observed 128 Am 2 /kg. In as-prepared condition Curie temperature (T c ) was found 316 o C, close compared to the T c of original FINEMET. Thus, a slight substitution (1 atomic %) of iron (Fe) by chromium (Cr) in original FINEMET enhances the thermo-magnetic stability of the alloy.

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Section: Introductionmentioning

confidence: 99%

Study of crystallization phases and magnetic properties of Fe72.5Cr1Nb3Cu1Si13.5B9 nanocrystalline alloy prepared by rapid quenching method

Mt¹

2020

MSEIJ

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“…Changes in the type or content of the elements in the amorphous alloy are known to be the way for improving magnetic, corrosion, and mechanical properties [11][12][13][14][15][16]. Substitution or change in the alloy content could also affect the crystallization kinetics and microstructure of partially crystallized samples.…”

Section: Introductionmentioning

confidence: 99%

Effects of chemical composition on nanocrystallization kinetics, microstructure and magnetic properties of finemet-type amorphous alloys

et al. 2013

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In this study, the kinetics of nanocrystallization of amorphous Fe73.5Si13.5B9Nb3Cu1 (F1) and Fe77Si11B9Nb2.4Cu0.6 (F2) alloys is investigated. The microstructure and magnetic properties of the nanocrystalline alloys are compared. The crystallization temperature of F2 alloy is shifted towards lower temperatures with respect to F1. Thus, the crystalline volume fraction and the crystalline grain size at specific annealing temperature for the F2 alloy are higher than for the F1 alloy, accounting for the higher coercive force of F2 alloy with respect to the one of F1 alloy. According to isoconversional methods, the activation energy for crystallization is variable as a function of transformed fraction because of the continuous changes in chemical composition during the transformation. Mean values of 350 and 290 kJ/mol are obtained for F1 and F2, respectively. Microstructural observations confirm that minor changes in chemical composition affect the kinetics and final microstructure of the nanocrystalline alloy, that determine the observed magnetic properties

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“…In previous works, [11][12][13][14] we have reported on the microstructural changes and the correlation with the soft magnetic behaviour in Fe-(Co or Ni)-Si-B-Nb-Cu (Co-Finemet or Ni-Finemet, respectively) amorphous alloy ribbons induced by two thermal treatments (using the Joule heating with and without tensile stress) in order to elucidate the complex magnetic behaviour which can be expected. It was analysed the effect of partial substitution of Fe atoms by Co or Ni in the classical Finemet composition on the coercive field.…”

Section: Introductionmentioning

confidence: 99%

Effect of the Current Annealing (without and with Tensile Stress) on the Soft Magnetic Behaviour of Fe73.5–x(Co0.5Ni0.5)xSi13.5B9Nb3Cu1 Alloy Ribbons (x = 2.5, 5 and 10)

Iturriza¹,

Nazmunnahar²,

Domínguez³

et al. 2012

j. nanosci. nanotech.

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Nanostructure and magnetic properties of Ni-substituted finemet ribbons

Cited by 7 publications

References 7 publications

Study of crystallization phases and magnetic properties of Fe72.5Cr1Nb3Cu1Si13.5B9 nanocrystalline alloy prepared by rapid quenching method

Study of crystallization phases and magnetic properties of Fe72.5Cr1Nb3Cu1Si13.5B9 nanocrystalline alloy prepared by rapid quenching method

Effects of chemical composition on nanocrystallization kinetics, microstructure and magnetic properties of finemet-type amorphous alloys

Effect of the Current Annealing (without and with Tensile Stress) on the Soft Magnetic Behaviour of Fe<SUB>73.5–<I>x</I></SUB>(Co<SUB>0.5</SUB>Ni<SUB>0.5</SUB>)<SUB><I>x</I></SUB>Si<SUB>13.5</SUB>B<SUB>9</SUB>Nb<SUB>3</SUB>Cu<SUB>1</SUB> Alloy Ribbons (<I>x</I> = 2.5, 5 and 10)

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