Trends in optimization of giant magnetoimpedance effect in amorphous and nanocrystalline materials

Zhukov, A.; Ipatov, M.; Churyukanova, M.; Talaat, A.; Blanco, J.M.; Zhukova, V.

doi:10.1016/j.jallcom.2017.08.119

Cited by 84 publications

(76 citation statements)

References 61 publications

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“…On the other hand, the predicted theoretical maximum GMI ratio is about 3000% [56,57], which is still a few times superior to the experimentally reported ∆Z/Z values [12,13,15]. Therefore, it is expected that technology improvement, as well as the development of effective postprocessing methods, will allow for the achievement of a higher GMI ratio.…”

Section: Of 11mentioning

confidence: 81%

Stress-Induced Magnetic Anisotropy Enabling Engineering of Magnetic Softness and GMI Effect of Amorphous Microwires

et al. 2020

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Stress-annealing enabled a considerable improvement in the GMI effect in both Fe-and Co-rich glass-coated microwires. Additionally, a remarkable magnetic softening can be achieved in stress-annealed Fe-rich microwires. Observed stress-annealing induced magnetic anisotropy is affected by annealing conditions (temperatures and stresses applied during annealing). The highest GMI ratio up to 310% was obtained in stress-annealed Co-rich microwires, although they presented rectangular hysteresis loops. A remarkable magnetic softness and improved GMI ratio over a wide frequency range were obtained in stress-annealed Fe-rich microwires. Irregular magnetic field dependence observed for some stress-annealing conditions is attributed to the contribution of both the inner axially magnetized core and outer shell, with transverse magnetic anisotropy.Appl. Sci. 2020, 10, 981 2 of 11 with respect to the varying of external stimuli, such as magnetic field, mechanical load and heat [30][31][32]. Consequently, metamaterials incorporating arrays of magnetic wires in fiber-reinforced polymer composites are potentially suitable for engineering of electromagnetic functionalities and stress/temperature monitoring.Industrial applications based on the GMI effect demand a size reduction of the magnetic element [16,17]. Therefore, the development of thin wires exhibiting GMI effect has become a topic of intensive research [4,5,[11][12][13][14][15]. Among different preparation techniques of magnetic wires, the so-called Taylor-Ulitovsky method allows for the thinnest wires' fabrication and reduced dimensions [11][12][13][14][15][16][31][32][33]. In order to observe the GMI effect in thin wires, the skin depth should be lower than the radius of the wire. As such, a decrease in diameter should be associated with an increase in the frequency range for observation of the GMI effect [34,35]. Besides these technical features, the overall cost should be also considered for applications (e.g., smart composites with wire inclusions) where substantial amounts of wires are required.Excellent soft magnetic properties with enhanced GMI effects are usually reported for as-prepared Co-rich [11][12][13][14][15] and nanocrystalline Fe-rich magnetic microwires [36,37]. The latter are often accompanied with an inherent brittleness of samples over the course of the nanocrystallization process, and therefore alternative stress-annealing approaches have been proposed, to enhance the GMI effect retaining the amorphous structure [38,39]. Stress-annealing can be performed in a temperature range well below the crystallization onset. In addition, the degree of stress-induced anisotropy can be selectively tuned through optimal annealing temperature, time and/or different values of applied stresses. Thus, this contribution aims at providing comparative studies on the effect of stress-induced anisotropy on magnetic softness and GMI effect in Fe-and Co-rich magnetic microwires.

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Section: Of 11mentioning

confidence: 81%

Stress-Induced Magnetic Anisotropy Enabling Engineering of Magnetic Softness and GMI Effect of Amorphous Microwires

et al. 2020

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“…The present GSR element shown in Figure 2 equips a wire with a composition of Co 50.7 Fe 8.1 B 13.3 Si 10.3 [31] and the permeability of 1800 with a diameter of 10 µm. The tested GSR elements have lengths of 0.16 mm, 0.45 mm, and 0.96 mm, a wire resistance of 3 Ω, 4.5 Ω, 8 Ω, and 13 Ω, coil turn numbers of 14, 32, 66, and 148, and finally a coil resistance of 80 Ω, 210 Ω, 360 Ω, and 810 Ω respectively.…”

Section: Methodsmentioning

confidence: 99%

“…The principle of the GSR effect induced in the amorphous wire with zero magnetostriction is explained in Figure 1. The wire has a special magnetic domain structure [31] that consists of surface domains with circular spins, axis magnetic domains, and 90-degree domain wall existing between the two domains. When an external magnetic field is applied to the wire along axis direction, the electronic spins in the surface domain tilt toward the axial direction, with the angle dependent on the magnetic field strength.…”

Section: Principle Of Gsr Effectmentioning

confidence: 99%

The Development of ASIC Type GSR Sensor Driven by GHz Pulse Current

Honkura¹,

Honkura²

2020

Sensors

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The GigaHertz spin rotation (GSR) effect was observed through the excitement of Giga Hertz (GHz) pulse current flowing through amorphous wire. The GSR sensor that was developed provides excellent features that enhanced magnetic sensitivity and sine functional relationship, as well as good linearity, absence of hysteresis, and low noise. Considering the GHz frequency range used for the GSR sensor, we assume that the physical phenomena associated with the operation of the sensor are based on spin reduction and rotation of the magnetization. The proper production technology needed was developed and a micro-sized GSR sensor was produced by directly forming micro coils on the surface of the application-specific integrated circuit (ASIC). Some prototypes of the ASIC type GSR sensor have been produced in consideration of applications such as automotive use, mobile device use, and medical use. Therefore, we can conclude that GSR sensors have great potential to become promising magnetic sensors for many applications.

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“…The thermal treatment of MWs helps to release internal stresses of the wires and this can modify the susceptibility, the magnetic anisotropy and the electrical resistivity, as well [32][33][34] . Therefore, the susceptibilities increase for the annealed samples should be given mainly by the stress release due to the thermal treatment 35,36 .…”

Section: Ac-hysteresis Loops At 50 Hzmentioning

confidence: 99%

Colossal heating efficiency via eddy currents in amorphous microwires with nearly zero magnetostriction

Morales

Archilla

Presa

et al. 2020

Sci Rep

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It is well stablished that heating efficiency of magnetic nanoparticles under radiofrequency fields is due to the hysteresis power losses. In the case of microwires (MWs), it is not clear at all since they undergo non-coherent reversal mechanisms that decrease the coercive field and, consequently, the heating efficiency should be much smaller than the nanoparticles. However, colossal heating efficiency has been observed in MWs with values ranging from 1000 to 2800 W/g, depending on length and number of microwires, at field as low as H = 36 Oe at f = 625 kHz. It is inferred that this colossal heating is due to the Joule effect originated by the eddy currents induced by the induction field B = M + χH parallel to longitudinal axis. This effect is observed in MWs with nearly zero magnetostrictive constant as Fe2.25Co72.75Si10B15 of 30 μm magnetic diameter and 5 mm length, a length for which the inner core domain of the MWs becomes axial. This colossal heating is reached with only 24 W of power supplied making these MWs very promising for inductive heating applications at a very low energy cost.

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Trends in optimization of giant magnetoimpedance effect in amorphous and nanocrystalline materials

Cited by 84 publications

References 61 publications

Stress-Induced Magnetic Anisotropy Enabling Engineering of Magnetic Softness and GMI Effect of Amorphous Microwires

Stress-Induced Magnetic Anisotropy Enabling Engineering of Magnetic Softness and GMI Effect of Amorphous Microwires

The Development of ASIC Type GSR Sensor Driven by GHz Pulse Current

Colossal heating efficiency via eddy currents in amorphous microwires with nearly zero magnetostriction

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