Influence of magnetostriction constant on magnetoimpedance–frequency dependence

García, Diosdado Baena; Raposo, V.; Montero, Oscar; Íñiguez, J.

doi:10.1016/j.sna.2005.11.046

Cited by 29 publications

(9 citation statements)

References 9 publications

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“…On analyzing these data, we can see that the largest magnetoimpedance effect occurs in alloys with an absolute minimum magnetostriction constant. This tendency is analogous to the results of [9]. In this context the behavior of the magnetoimpedance effect in the alloy with a nickel content x = 12 is, to some extent, anomalous.…”

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confidence: 84%

“…The lowest peak ΔZ/Z, ranging from 0.11-0.13, is observed in the alloys with nickel contents x = 6, 4, and 12, while for nickel contents x = 8 and 10 the peak is higher, at ≈0.18-0.19. The maximum magnetoimpedance effect attained in these curves with an alternating current at a frequency f ~ 200 kHz can be explained on the basis of the results of [8] and [9], by comparing the maximum values of the magnetoimpedance effect with the corresponding variations in the magnetostriction of the samples. The magnetostriction constants for samples of Co 80-x Ni x B 20 with a variable nickel content have been determined in [8], where it was shown that these constants are close to zero for these alloys.…”

mentioning

confidence: 96%

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Optical properties and the magnetoimpedance effect in amorphous Co-Ni-B metal alloys

2010

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A magnetoimpedance effect is observed in Co 6,8,10, 12) amorphous metal alloy ribbons when an alternating current at frequencies ranging from 1-3000 kHz is passed through samples in an external magnetic field. Spectra of the permittivity and optical conductivity of the surface of ribbons of these alloys are obtained for incident photon energies of 1.0-5.0 eV. The relationships between the magnitude of the magnetoimpedance effect, and the magnetic properties, electronic structure parameters, and optical characteristics of the amorphous alloy samples are determined.Keywords: amorphous metal alloy ribbons, giant magnetoimpedance effect, electronic structure parameters. Introduction.Since 1997 the density of magnetic memory has increased annually by a factor of two through use of magnetoimpedance readout [1]. The magnetoimpedance effect, which involves a large change in the impedance of a ferromagnetic conductor in the presence of an external magnetic field, is inherent to multilayer films, granular structures, and amorphous ribbons when high frequency currents flow through them. The magnetoimpedance effect has the greatest sensitivity to very weak magnetic fields [2][3][4]. It is attributed to spin dependence scattering of conduction electrons. This effect is characteristic of low-coercitivity amorphous alloys based on cobalt, as well as of multilayer films with alternating ferromagnetic and nonmagnetic layers or of granular ferromagnetic materials in a conducting matrix. Active research on the magnetoimpedance effect has led to the birth of a family of new materials with extensive possible applications, including spin valves, structures with magnetic tunnel transitions, and spin nanotransistors [5].Since IR optical phenomena in metals are associated with intraband optical transitions and are, to a certain extent, analogous to the behavior of dc electrical resistance, it is assumed that when an alternating current is passed through an amorphous metal alloy ribbon in a magnetic field, a correlation of its optical and magnetoimpedance characteristics should also be observed [6]. In this paper we present data from an experimental study of changes in the optical characteristics of Co-based amorphous metal alloy ribbons in external magnetic fields at photon energies of 1.0-5.0 eV and establish their relationship to the magnetoimpedance effect observed in samples of cobalt-based amorphous metal alloy ribbons containing different concentrations of nickel.Experiment. Samples of amorphous metal alloy were obtained by ultra-fast quenching from a melt in the form of 5-mm-wide, 20-μm-thick ribbons from a mixture of Co, Ni, and B in the appropriate proportions. The final composition of the ribbons was checked using Auger analysis. The amount of each element was found to be in agreement with the chemical formula to within 0.5-1.0 at. %. The magnetoimpedance effect was studied in magnetic fields of up to 100 Oe with frequencies of the alternating current passing through the sample ranging over 1-3000 kHz. During the measurements ...

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confidence: 96%

Optical properties and the magnetoimpedance effect in amorphous Co-Ni-B metal alloys

2010

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“…The composite of carbon fiber and FeNi with the smaller diameter and the higher elastic coefficient displays a large GMI result at a relative small applied field than traditional metal coaxial structures, which provides a kind of competitive material for future magnetic sensor. In contrast, because the symmetry of wires [32][33][34][35][36] is better than ribbons [37,38], films [39][40][41] and other stratified [42] structures, the GMI ratio of the former is better the latter. Although Co-based amorphous wires and composite wires [27,32,33] have higher GMI ratio even at larger magnetic field, cobalt is an expensive metal, which will restrict the extension in commercial application.…”

Section: Static Magnetic and Gmi Properties Of Composites With Differmentioning

confidence: 94%

Enhanced magnetoimpedance effect of carbon fiber/Fe-based alloy coaxial composite by tensile stress

Zhang

Gan

Dong

et al. 2015

Carbon

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“…The giant magnetoimpedance (GMI) effect is a topic of great interest in the field of applied magnetism owing to the large sensitivity of the total impedance to an applied magnetic field . Our previous investigation using the magneto‐optical Kerr effect (MOKE) showed that the surface magnetic structure has a great influence on the value of the GMI ratio .…”

Section: Introductionmentioning

confidence: 99%

On mechanisms of domain switching in amorphous glass‐coated wires

Chizhik

Stupakiewicz

Zhukov

et al. 2015

Physica Status Solidi (a)

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The study of the magnetic properties of amorphous wires is a topic of great interest because of their outstanding properties, such as the giant magnetoimpedance effect. The domain structure of the amorphous wire consists of an axially magnetized inner core and the outer shell. Taking into account that the giant magnetoimpedance effect is mainly a surface effect, the investigation of surface magnetic structure in the outer shell becomes a special topic. Discovering earlier the basic domain structures, here we demonstrate the original domain structures and mechanisms of magnetization reversal in Co-and Fe-rich glass-covered microwires. In particular, we focused on the temperature dependence of the magnetization reversal process. The original effect -the rearrangement of domain structure without the domain walls movement -was found.ß 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim 1 Introduction The giant magnetoimpedance (GMI) effect is a topic of great interest in the field of applied magnetism owing to the large sensitivity of the total impedance to an applied magnetic field [1-8]. Our previous investigation using the magneto-optical Kerr effect (MOKE) showed that the surface magnetic structure has a great influence on the value of the GMI ratio [8]. In particular, it was shown that the change of circular magnetization is the essential process influencing GMI. Generally, the mechanism of the magnetization reversal process in microwires consists of nucleation of magnetic domain structures [9], magnetic domain-wall (DW) motion, domain-structure transformations, magnetization switching between different magnetization states, and coherent rotation of magnetization. Earlier our investigations were focused on the single or multidomain-wall motion [10] and formation of multidomain structure. However, as reported in the present work, this magnetization reversal consists not only of DW motion but also of domain-structure rearrangement which does not include the DW motion. Here, we demonstrate the unusual mechanism of domain-structure transformation of both DW motion and magnetization switching of domain structures.

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Influence of magnetostriction constant on magnetoimpedance–frequency dependence

Cited by 29 publications

References 9 publications

Optical properties and the magnetoimpedance effect in amorphous Co-Ni-B metal alloys

Optical properties and the magnetoimpedance effect in amorphous Co-Ni-B metal alloys

Enhanced magnetoimpedance effect of carbon fiber/Fe-based alloy coaxial composite by tensile stress

On mechanisms of domain switching in amorphous glass‐coated wires

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