Controlling the Curie temperature in amorphous glass coated microwires by heat treatment

Dzhumazoda, A.; Panina, L.V.; Nematov, M.G.; Табаров, Ф. С.; Морченко, А. Т.; Базлов, А. И.; Ukhasov, A.; Yudanov, N. A.; Podgornaya, S.V.

doi:10.1016/j.jallcom.2019.06.095

Cited by 7 publications

(7 citation statements)

References 22 publications

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“…As shown in Figure 10, a substantial and monotonous increase in T c is observed for both studied microwires after annealing. Similar dependencies of T c upon annealing have been observed in various Fe-, Co-and Ni-rich amorphous alloys [46][47][48]. Such an increase in T c of amorphous alloys upon annealing has been commonly attributed to structural relaxation of amorphous alloys [46][47][48].…”

Section: Resultssupporting

confidence: 68%

The Magnetostriction of Amorphous Magnetic Microwires: The Role of the Local Atomic Environment and Internal Stresses Relaxation

Zhukova,

García-Gómez,

Gonzalez

et al. 2023

Magnetochemistry

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We studied the magnetostriction coefficients, λs, Curie temperature, Tc, and their dependence on annealing conditions in Fe47Ni27Si11B13C2 and Co67Fe3.9Ni1.5B11.5Si14.5Mo1.6 amorphous glass-coated microwires with rather different character of hysteresis loops. A positive λs ≈ 20 × 10−6 is observed in as-prepared Fe47Ni27Si11B13C2, while low and negative λs ≈ −0.3 × 10−6 is obtained for Co67Fe3.9Ni1.5B11.5Si14.5Mo1.6 microwire. Annealing affects the magnetostriction coefficients and Curie temperatures, Tc, of both Fe47Ni27Si11B13C2 and Co67Fe3.9Ni1.5B11.5Si14.5Mo1.6 glass-coated microwires in a similar way. Observed dependencies of hysteresis loops, λs and Tc on annealing conditions are discussed in terms of superposition of internal stresses relaxation and structural relaxation of studied microwires. We observed linear λs dependence on applied stress, σ, in both studied microwires. A decrease in the magnetostriction coefficient upon applied stress is observed for Co-rich microwires with low and negative magnetostriction coefficient. On the contrary, for Fe-Ni-rich microwires with a positive magnetostriction coefficient, an increase in the magnetostriction coefficient with applied stress is observed. The observed results are discussed considering the internal stresses relaxation and short range atomic rearrangements induced by annealing on hysteresis loops, magnetostriction coefficients and Curie temperatures of studied microwires.

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Section: Resultssupporting

confidence: 68%

The Magnetostriction of Amorphous Magnetic Microwires: The Role of the Local Atomic Environment and Internal Stresses Relaxation

Zhukova,

García-Gómez,

Gonzalez

et al. 2023

Magnetochemistry

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“…Consequently, considerable modifications in λ s and T c are observed in Co 67 Fe 3.85 Ni 1.45 B 11.5 Si 14.5 Mo 1.7 (ρ ≈ 0.96) microwire after annealing (see Figure 14). Similar influence of annealing on λ s and T c observed in various Fe-, Co-, and Ni-rich amorphous alloys were commonly associated with changes in short-range atomic order of amorphous alloys [67,[69][70][71]. Consequently, the origin of the observed changes in magnetic anisotropy, magnetic softness, and the GMI effect in the studied Fe-and Co-rich glass-coated microwires induced either by annealing or by stress annealing can be explained by considering internal stress relaxation, back stresses, or structural magnetic anisotropy.…”

Section: Tailoring Of the Gmi Effect And The Magnetic Softness In Co-...supporting

confidence: 55%

“…Thus, the coercivity, H c , is among the properties affected by short-range order in the arrangement of atoms [68]. Among the most sensitive magnetic parameters to local structural rearrangements are the Curie temperature, T c , and the magnetostriction coefficient, λ s [67,[69][70][71]. Thus, substantial changes in T c and λ s reported in various Fe-, Coand Ni-rich amorphous magnetic materials [67,[69][70][71].…”

Section: Tailoring Of the Gmi Effect And The Magnetic Softness In Co-...mentioning

confidence: 99%

“…Among the most sensitive magnetic parameters to local structural rearrangements are the Curie temperature, T c , and the magnetostriction coefficient, λ s [67,[69][70][71]. Thus, substantial changes in T c and λ s reported in various Fe-, Coand Ni-rich amorphous magnetic materials [67,[69][70][71]. Consequently, considerable modifications in λ s and T c are observed in Co 67 Fe 3.85 Ni 1.45 B 11.5 Si 14.5 Mo 1.7 (ρ ≈ 0.96) microwire after annealing (see Figure 14).…”

Section: Tailoring Of the Gmi Effect And The Magnetic Softness In Co-...mentioning

confidence: 99%

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Optimization of Giant Magnetoimpedance Effect of Amorphous Microwires by Postprocessing

Zhukova,

Corte-Leon,

Talaat

et al. 2024

Processes

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Magnetic microwires with amorphous structures can present a unique combination of excellent magnetic softness and giant magnetoimpedance (GMI) effects together with reduced dimensions and good mechanical properties. Such unique properties make them suitable for various technological applications. The high GMI effect, observed in as-prepared Co-rich microwires, can be further optimized by postprocessing. However, unexpected magnetic hardening and a transformation of the linear hysteresis loop into a rectangular loop with a coercivity on the order of 90 A/m were observed in several Co-rich microwires upon conventional annealing. Several routes to improve magnetic softness and GMI effect in Fe- and Co-rich magnetic microwires are provided. We observed that stress annealing could remarkably improve the magnetic softness and GMI ratio of Co-rich microwires. Thus, almost unhysteretic loops with a coercivity of 2 A/m and a magnetic anisotropy field of about 70 A/m are achieved in Co-rich microwires stress annealed at appropriate conditions. The observed change in hysteresis loops and the GMI effect is explained by stress-annealing-induced anisotropy, which is affected by the stresses applied during annealing and by the annealing temperature. While as-prepared Fe-rich amorphous microwires present a low GMI effect, appropriate postprocessing (annealing and stress annealing) allows for a remarkable GMI ratio improvement (an order of magnitude). The evaluated dependence of the maximum GMI ratio on frequency allows the identification of the optimal frequency band for the studied samples. The origin of stress-annealing-induced anisotropy and related changes in hysteresis loops and the GMI effect are discussed in terms of the relaxation of internal stresses, “back-stresses”, as well as structural anisotropy.

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“…In amorphous materials, the short-range ordering can be modified by various annealing treatments [22,23]. This is important from the perspective of tuning the magnetic structure and controlling the magnetic parameters such as uniaxial anisotropy, magnetostriction, and Curie temperature [24,25,26,27]. In particular, annealing in the presence of a magnetic field forms the easy anisotropy axis along the field if the annealing temperature is lower than the Curie temperature.…”

Section: Introductionmentioning

confidence: 99%

Soft Magnetic Amorphous Microwires for Stress and Temperature Sensory Applications

Panina

Dzhumazoda

Nematov

et al. 2019

Sensors

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Amorphous ferromagnetic materials in the form of microwires are of interest for the development of various sensors. This paper analyzes and argues for the use of microwires of two basic compositions of Co71Fe5B11Si10Cr3 and Fe3.9(4.9)Co64.82B10.2Si12Cr9(8)Mo0.08 as stress/strain and temperature sensors, respectively. The following properties make them suitable for innovative applications: miniature dimensions, small coercivity, low anisotropy and magnetostriction, tunable magnetic structure, magnetic anisotropy, and Curie temperature by annealing. For example, these sensors can be used for testing the internal stress/strain condition of polymer composite materials and controlling the temperature of hypothermia treatments. The sensing operation is based on the two fundamental effects: the generation of higher frequency harmonics of the voltage pulse induced during remagnetization in wires demonstrating magnetic bistability, and magnetoimpedance.

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Controlling the Curie temperature in amorphous glass coated microwires by heat treatment

Cited by 7 publications

References 22 publications

The Magnetostriction of Amorphous Magnetic Microwires: The Role of the Local Atomic Environment and Internal Stresses Relaxation

The Magnetostriction of Amorphous Magnetic Microwires: The Role of the Local Atomic Environment and Internal Stresses Relaxation

Optimization of Giant Magnetoimpedance Effect of Amorphous Microwires by Postprocessing

Soft Magnetic Amorphous Microwires for Stress and Temperature Sensory Applications

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