Creep or tensile stress induced anisotropy in FINEMET-type ribbons?

Csizmadia, Elek; Varga, L.K.; Palánki, Z.; Zámborszky, F.

doi:10.1016/j.jmmm.2014.08.066

Cited by 16 publications

(12 citation statements)

References 16 publications

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“…Reduced permeability is consistent with the results obtained in [15,16] while the resulting reduction of the loss by heating under stress is inconsistent with the results obtained in [8,12], where it was shown that an increase in transverse anisotropy led to an increase of both relative loss per cycle [8] and coercitivity [12]. Perhaps this difference is associated with a different way of ribbon heating.…”

Section: Rapid Heating Of the Ribbon By Electric Current Under Tensilsupporting

confidence: 58%

“…In particular, previous studies were focused on the influence of rapid heating under tensile stress on the magnetic properties of amorphous ribbon [13][14][15]. To the best of our knowledge, there are no studies that demonstrate the advantages of the cores made of the obtained ribbons as compared to the cut (with non-magnetic gap) cores made of the same alloy; the authors of the papers [13,14,16,17] carry out the comparison with the cores with approximately the same permeability but made of other materials.…”

Section: Introductionmentioning

confidence: 99%

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Soft magnetic properties of nanocrystalline Fe73B7Si16Nb3Cu1 alloy after rapid heating under tensile stress

Nosenko¹,

Mika²,

Rudenko³

et al. 2016

Nano Online

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Amorphous Fe 73 B 7 Si 16 Nb 3 Cu 1 ribbon was crystallized rapidly by electric current heating under simultaneously applied tensile stress along the ribbon axis. As a result, strong transverse magnetic anisotropy was induced in the ribbon. Dynamic magnetic properties of the ribbons rapidly heated either under the tensile stress or without tensile stress were measured using toroidal cores. Optimal electric current heating regime that provides maximum improvement of the initial magnetic permeability and core loss was determined. Tensile stress increase from 0 to 180 MPa was shown to result in the decrease of the initial magnetic permeability down to 400 and core loss at frequencies from 0.4 to 200 kHz. Comparative analysis of magnetic properties of the cut core (with non-magnetic gap) and the cores heated under tensile stress was carried out. The magnetic properties of the latter cores are advantageous for manufacturing the reactors and linear chokes of switch-mode power supplies.

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Section: Rapid Heating Of the Ribbon By Electric Current Under Tensilsupporting

confidence: 58%

Section: Introductionmentioning

confidence: 99%

Soft magnetic properties of nanocrystalline Fe73B7Si16Nb3Cu1 alloy after rapid heating under tensile stress

Nosenko¹,

Mika²,

Rudenko³

et al. 2016

Nano Online

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“…where o µ is the vacuum permeability, eff µ is the effective permeability and J s is the saturation magnetization.The inverse relationship between effective permeability and the uniaxial magnetic anisotropy of FINEMET type alloys seen in the work done Csizmadia et al [29] is shown in Figure 3.…”

Section: Stress Anisotropymentioning

confidence: 81%

Research Progress of Stress-Induced Magnetic Anisotropy in Fe-Based Amorphous and Nanocrystalline Alloys

Nutor¹,

Fan²,

Ren³

et al. 2017

JEMAA

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Since it was discovered that stress annealing induced larger anisotropies compared to other annealing methods in amorphous and nanocrystalline alloys, there has been a lot of research done to explain this phenomenon. This has led to many suggestions about the origin of this stress-induced magnetic anisotropy, but till now the origin is explained with two competing models: the magnetoelastic effect model and the diatomic pair ordering model. In spite of these theories, the origin of the stress-induced anisotropy is still under discussion because direct observation of structural anisotropy is still lacking. In this paper, we have reviewed some of the characterization techniques which have been used to discuss the origin of stress-induced magnetic anisotropy and the progress which has been made thus far in unifying all the contrasting views which has been suggested to be the origin of the stress-induced anisotropy in FINEMET alloys.

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“…Low permeability soft magnetic cores are necessary for some applications in which higher levels of magnetic energy storage are required [7], and reaching lower permeability (but still high saturation induction and low core losses) is achievable by stress annealing of nanocrystalline ribbons and inducing magnetic anisotropy. The main studies on stress annealing of soft magnetic ribbons include the application of tensile stress on straight ribbons prior to the tape winding [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Magnetic Properties in Finemet-Type Soft Magnetic Toroidal Cores Annealed under Radial Stresses

Zhang

Sohrabi

et al. 2020

Metals

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Applying tensile stresses on straight soft magnetic ribbons before core fabrication is a routine method of inducing magnetic anisotropy, while methods of stress annealing of ribbons after core winding are seldom explored. In this study, we utilize a novel approach to induce magnetic anisotropy by applying radial stresses on tape-wound cores of Fe73.5Si13.5B9Cu3Nb1 (at. %) ribbon during crystallization heat treatment. The results show that while stress annealing does not change the structural characteristics of annealed samples, the magnetic anisotropies induced can increase to values ~3–5 times larger than the sample annealed in the absence of external stress. This increase in magnetic anisotropy energy is associated with ~25–50% decrease of magnetic inductance in the treated cores. These results suggest that the magnetic properties of nanocrystalline soft magnetic alloys can be effectively tuned by applying radial stresses.

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Creep or tensile stress induced anisotropy in FINEMET-type ribbons?

Cited by 16 publications

References 16 publications

Soft magnetic properties of nanocrystalline Fe73B7Si16Nb3Cu1 alloy after rapid heating under tensile stress

Soft magnetic properties of nanocrystalline Fe73B7Si16Nb3Cu1 alloy after rapid heating under tensile stress

Research Progress of Stress-Induced Magnetic Anisotropy in Fe-Based Amorphous and Nanocrystalline Alloys

Magnetic Properties in Finemet-Type Soft Magnetic Toroidal Cores Annealed under Radial Stresses

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