Effect of electrolytic oxidation and hydrogenation on the magnetization distribution and magnetic properties of ribbons of amorphous soft magnetic iron-based alloys

Skulkina, N. A.; Иванов, О. А.; Степанова, Е. А.; Pavlova, I. O.

doi:10.1134/s0031918x11040144

Cited by 20 publications

(7 citation statements)

References 2 publications

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“…In this case, some reduction is observed in the volume of domains with orthogonal magnetization. This can be a consequence of the action of plain tensile stresses caused by the entry of hydrogen and oxygen into the surface layer of the ribbon [8,9] against a background of a higher degree of relaxation of internal quench stresses, since the limitation of diffusion processes at the stage of cooling favors the retention of an enhanced concen tration of atoms embedded into the surface. In addi tion, the increased cooling rate allows one to retain a larger difference between concentrations of atoms embedded into the ribbon surface along and transverse to the axis.…”

Section: Introductionmentioning

confidence: 99%

Effect of parameters of heat treatment on magnetic properties and magnetization distribution in ribbons of amorphous soft magnetic iron-based alloys

Skulkina

Иванов

Pavlova

et al. 2013

Phys. Metals Metallogr.

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Abstract-The effect of the isothermal holding temperature and cooling rate upon in air heat treatment on the magnetic properties and magnetization distribution in ribbons of amorphous soft magnetic iron based alloys with positive saturation magnetostriction has been investigated. The results of the investigation showed that the dependence of the maximum magnetic permeability on the isothermal holding temperature corre lates with the corresponding changes in the magnetization distribution in the ribbon and is determined by dif fusion processes that occur upon in air heat treatment at a specific isothermal holding temperature. An increase in the cooling rate leads to an ambiguous effect on the level of magnetic properties. The increase favors an improvement in magnetic properties when, after in air heat treatment, either a predominantly amorphous state of the surface or a state with the formed amorphous-crystalline surface layer with a nearly optimal thickness is obtained.

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Section: Introductionmentioning

confidence: 99%

Effect of parameters of heat treatment on magnetic properties and magnetization distribution in ribbons of amorphous soft magnetic iron-based alloys

Skulkina

Иванов

Pavlova

et al. 2013

Phys. Metals Metallogr.

Self Cite

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“…Substituting (1) into (3) and taking into account the additional anisotropy K is which is induced in the unloaded ribbon during the pre-heating in air [12], we get the formula for calculating the magnetic anisotropy energy at zero creep ( σ t = 0 MPa) …”

Section: Resultsmentioning

confidence: 99%

“…The origin of the additional magnetic anisotropy K is , according to [12], is the influence of the environment, i.e., the interaction of ribbon’s surfaces with oxygen, hydrogen, and water vapor which leads to anisotropic crystallization of surfaces.…”

Section: Resultsmentioning

confidence: 99%

Effect of Mechanical Stresses in Rapidly Heated Fe73Cu1Nb3Si16B7 Ribbon Arising During the Ring Core Formation on Their Magnetic Properties

et al. 2017

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The influence of winding-induced mechanical stresses on the magnetic anisotropy and core loss in toroidal cores made of Fe73Cu1Nb3Si16B7 ribbon is studied. The ribbon for the cores was rapidly pre-heated under tensile stress up to 120 MPa. It was found that magnetic characteristics of the material (magnetic anisotropy energy and the core loss) can be controlled by varying the tensile stress during the preliminary rapid heating of the ribbon. It was shown that with reducing core diameter, the magnetic anisotropy energy and core loss significantly increase. However, relatively high winding-induced core loss in small cores can be significantly reduced by increasing tensile stresses applied to the ribbon during pre-heating.

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“…The presence of this significant transverse anisotropy is also demonstrated by a reduction of remanence to saturation ratio B r / B s (remanence induction B r to saturation induction B s ratio). Indeed, B r / B s = 0.7 for core annealed in the furnace at Т а = 550°С, t a = 90 min, and B r / B s = 0.43 for the core heated by electric current at j h = 42 А/mm 2 and t h = 3.7 s. The possible cause of the additional magnetic anisotropy in amorphous ribbons (not related to the tensile stress) that is induced during nanocrystallization at rapid heating is, in our opinion, the influence of the surrounding atmosphere, e.g., anisotropic oxidation and hydrogenation of the ribbon and consequent anisotropic crystallization of the ribbon surfaces [ 22 ].…”

Section: Resultsmentioning

confidence: 99%

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

et al. 2015

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Amorphous Fe73B7Si16Nb3Cu1 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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Effect of electrolytic oxidation and hydrogenation on the magnetization distribution and magnetic properties of ribbons of amorphous soft magnetic iron-based alloys

Cited by 20 publications

References 2 publications

Effect of parameters of heat treatment on magnetic properties and magnetization distribution in ribbons of amorphous soft magnetic iron-based alloys

Effect of parameters of heat treatment on magnetic properties and magnetization distribution in ribbons of amorphous soft magnetic iron-based alloys

Effect of Mechanical Stresses in Rapidly Heated Fe73Cu1Nb3Si16B7 Ribbon Arising During the Ring Core Formation on Their Magnetic Properties

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

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