The magnetic after-effect in amorphous and nanocrystalline Fe - Cu - Nb - Si - B alloys

Zbroszczyk, J.; Ciurzyńska, W.

doi:10.1088/0953-8984/9/20/025

Cited by 6 publications

(5 citation statements)

References 49 publications

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“…A special group of MAE spectra are those composed of more than one broad peak. Two peaks appear in ternary Fe 20 Ni 60 B 20 [1] and the Fe-Co-Zr system [11], but multi-peak MAE spectra can be more frequently found in multicomponent alloys [12][13][14][15][16][17]. The features of these peaks and their positions well under the Curie temperature indicate that they originate from thermally activated processes.…”

Section: Introductionmentioning

confidence: 99%

Directional ordering in amorphous Co–Si–B alloys

Andrejco¹,

Vojtaník²

2004

J. Phys.: Condens. Matter

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Directional ordering in the amorphous Co75Si15B10 alloys by means of the magnetic after-effect (MAE) of the initial reluctivity and its influence on the Perminvar effect have been investigated. Two peak MAE spectra were obtained from isochronal measurements for as-cast as well as annealed samples. The spectrum of the as-cast sample has peak maxima at 383 and 545 K. Comparing this MAE spectrum with the spectrum of amorphous Co75B25 alloy, we identified the first peak as a result of Co–B atom pair reorientation (B-type relaxation) and the second one at higher temperatures as a result of Co–Si atom pair reorientation (Si-type relaxation). After annealing, the peaks shift to 442 and 576 K, respectively. For the numerical analysis of Co75Si15B10 MAE spectra we modified the micromagnetic model assuming the existence of more relaxation processes, where each process is connected to the relaxation of one metalloid element. The pre-exponential factor for B-type relaxation was found to be τ0,AC(B) = 7 × 10−17 s with the most probable activation energy QAC*(B) = 1.31 eV. These values correlate very well with the magnetic relaxation (MR) activation parameters of Co75B25 alloy, τ0,AC = 2 × 10−17 s and QAC* = 1.35 eV. Si-type relaxation has activation parameters τ0,AC(Si) = 6 × 10−18 s and QAC*(Si) = 1.96 eV. After annealing the sample at 683 K for 30 min they change to values τ0,AN(B) = 2 × 10−15 s, QAN*(B) = 1.38 eV and τ0,AN(Si) = 3 × 10−17 s, QAN*(Si) = 2.01 eV. The complicated shapes of the long-time isotherms reflect the superposition of two relaxation processes. We have numerically split each isotherm into two sub-isotherms representing the particular contributions of the two relaxation processes. The MAE spectrum of the critical field measured on the as-cast sample also has two peaks, like the reluctivity spectrum. The impact of Co–B and Co–Si atom pairs on the behaviour of the domain wall stabilization potential is discussed for the explanation of the observed MR results.

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Section: Introductionmentioning

confidence: 99%

Directional ordering in amorphous Co–Si–B alloys

Andrejco¹,

Vojtaník²

2004

J. Phys.: Condens. Matter

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“…It is caused in magnetic amorphous materials by reversible structural relaxations related to small displacements of atoms. Disaccomodation of magnetic susceptibility consists of decreasing the value of magnetic susceptibility of a sample demagnetized with an alternating current over time, with an amplitude descending to zero [18,24,25]. A typical magnetic susceptibility deaccomodation curve (magnetic susceptibility relaxation) is shown in Figure 8.…”

Section: Discussionmentioning

confidence: 99%

“…The directional ordering of the interstitial atoms leads to a new distribution of atoms, corresponding to the new domain structure. The bottom of the potential, in which the domain wall is located, is "deepened" (Figure 9a), which in turn reduces the magnetic susceptibility, i.e., its disaccomodation [25].…”

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confidence: 99%

Magnetization Processes in Metallic Glass Based on Iron of FeSiB Type

2022

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In the present paper, the magnetization processes in amorphous alloys based on iron are discussed in detail. Our main goal was to measure the stabilization energy connected with the presence of microvoids (frozen during rapid cooling from the liquid phase) and to determine the interaction energy of relaxators with spontaneous magnetization vector (the so-called wN Neel) for amorphous Fe78Si13B9 alloys. A structural analysis of the alloys using X-ray measurements at the subsequent stages of crystallization was also performed.

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“…Analysis of the relaxation spectra of the Fe 80 Zr 4 Ti 3 B 12 Cu 1 alloy in the as-quenched state and after annealing at 573 K for 1 ks were done using lognormal distributions of relaxation times. More detailed information about isochronal disaccommodation spectra analysis can be found elsewhere [10]. According to Refs.…”

Section: Article In Pressmentioning

confidence: 99%

“…According to Refs. [9,10] the isochronal disaccommodation curve described as a superposition of the individual relaxation processes can be expressed by the formula…”

Section: Article In Pressmentioning

confidence: 99%