Torsion annealing influence on the impedance behaviour in amorphous FeSiB and CoSiB wires

Sánchez, T.; Álvarez, Pablo; Olivera, J.; Pérez, M.J.; Belzunce, F. J.; Santos, Joana; Ll., J.L. Sánchez; Sánchez, M.L.; Gorría, P.; Hernando, B.

doi:10.1016/j.jnoncrysol.2006.12.098

Cited by 5 publications

(6 citation statements)

References 13 publications

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“…The sensitivities are huge: 106%/Oe in the as-quenched wire, and 600%/Oe in the annealed one. The two-peak MI behaviour that appears for these wires has been related to the rotational magnetization process occurring near the anisotropy field of the circular domain in the outer shell of the wire [27,48]. The circular anisotropy field is then ±2 Oe for the as-quenched wire and decreases a little bit, to ±1.5 Oe in the annealed one.…”

Section: Microstructure Influence On Soft Magnetic Properties: Nanocrmentioning

confidence: 90%

“…Due to this reason, the induced anisotropy in this wire should only be brought about by the applied torsional stress. The nature of the torsion-induced magnetic anisotropy in the Fe 77.5 Si 7.5 B 15 wires would be a magnetoelastic one [27].…”

Section: Methodsmentioning

confidence: 99%

“…This result seems to indicate that after the annealing treatment, the torsion-induced helical anisotropy has partially balanced the intrinsic one, decreasing the angle between the easy axis and the wire axis. Although the helical anisotropy is not uniform along the wire radius, its magnitude is the highest at the wire surface changing the domain structure [27,51]. Fig.…”

Section: Microstructure Influence On Soft Magnetic Properties: Nanocrmentioning

confidence: 96%

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Magnetoimpedance in soft magnetic amorphous and nanostructured wires

et al. 2011

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The surface impedance tensor approach has been used to review the impedance response in a variety of amorphous and nanocrystallized wires. An experimental study on the torsion annealing effect on the magnetoimpedance (MI) behaviour for positive and negative magnetostriction amorphous wires of FeSiB and CoSiB compositions, respectively, has been carried out. Moreover, the influence of the onset nanocrystallization on the MI behaviour in Finemet-type alloys, with particular attention focussed on the case that the wires are annealed under applied torsional stress, is also presented. The analysis of the MI and torsion-impedance (TI) effects allows us to compare the different magnetic characteristics observed in a variety of wires. Special attention is paid to new results of the off-diagonal MI huge responses of these ferromagnetic samples, which are also a very useful source of information on the magnetic properties of the wires.

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Section: Microstructure Influence On Soft Magnetic Properties: Nanocrmentioning

confidence: 90%

Section: Methodsmentioning

confidence: 99%

Section: Microstructure Influence On Soft Magnetic Properties: Nanocrmentioning

confidence: 96%

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Magnetoimpedance in soft magnetic amorphous and nanostructured wires

et al. 2011

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“…Domain patterns are not observed on the field quenched ribbon surface as a consequence of the magnetization direction, that lies in the ribbon plane throughout the entire sample. Both Fe-based samples have a magnetostriction of the order of +10 −5 [8]. The considerably different domain structure of the ribbons surface is a consequence of the transverse anisotropy component induced on the fq sample during the quenching procedure [9].…”

Section: Methodsmentioning

confidence: 99%

“…This effect is referred to as off-diagonal MI. Off--diagonal MI has been measured before in amorphous magnetic ribbons and wires [7,8]. * corresponding author; e-mail: grande@uniovi.es…”

Section: Introductionmentioning

confidence: 99%

Off-Diagonal Magnetoimpedance Dependence of Magnetostriction and Anisotropy in Co-Based and Fe-Based Amorphous Ribbons

et al. 2010

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The object of this work is the comparison of domain structure and off-diagonal magnetoimpedance effect in amorphous ribbons with different magnetostriction coefficient. The Co 66 Fe 4 Ni 1 Si 15 B 14 and Fe 80 B 20 samples were obtained by melt-spinning. During the quenching procedure a 0.07 T transverse magnetic field was applied to some of the samples. Domain patterns obtained by the Bitter technique confirm that the differences on the samples are related to the different anisotropy and magnetostriction coefficient, and the quenching procedure. Small changes on the anisotropy distribution and the magnetostriction coefficient can be detected by the off-diagonal impedance spectra as a consequence of the different permeability values of the samples.

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