The Experts below are selected from a list of 2385 Experts worldwide ranked by ideXlab platform
Hongwei Qin - One of the best experts on this subject based on the ideXlab platform.
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Giant Magnetoimpedance and colossal ac magnetoresistance of a Cu coil wound on La0.67Sr0.33MnO3
Solid State Communications, 2011Co-Authors: Yifei Wang, Juan Chen, Hongwei QinAbstract:Abstract We observed the Giant Magnetoimpedance and colossal ac magnetoresistance for a Cu coil wound on La0.67Sr0.33MnO3 under low dc magnetic fields. Even though the dc magnetoresistance Δ R / R 0 for La0.67Sr0.33MnO3 plate is only −2.4% under H = 12 kOe, a Cu coil wound on La0.67Sr0.33MnO3 plate exhibits a colossal ac magnetoresistance Δ R / R 0 of −93% at 10 MHz and a Giant Magnetoimpedance Δ Z / Z 0 of −59% in a wide frequency range of 500 kHz–10 MHz under a longitudinal field H = 600 Oe . The transverse Magnetoimpedance is weaker than the longitudinal one. The Giant Magnetoimpedance and colossal ac magnetoresistance for a Cu coil wound on La0.67Sr0.33MnO3 are connected with the variation of permeability induced by dc magnetic field.
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Sample thickness dependence of Giant Magnetoimpedance under low fields for La0.67Sr0.33Mn0.98Co0.02O3 manganites
Journal of Alloys and Compounds, 2011Co-Authors: Yifei Wang, Yongjia Zhang, Hua Liu, Hongwei QinAbstract:Abstract The La 0.67 Sr 0.33 Mn 0.98 Co 0.02 O 3 plate sintered at 1250 °C shows a low field magnetoresistance (LFMR) effect under fields H R / R 0 is very small, only −1.84% under H = 4.6 kOe. The character of helical growth was observed on grain surface of La 0.67 Sr 0.33 Mn 0.98 Co 0.02 O 3 phase. The LFMR is connected with the interface of grain or grain boundary, while the Giant Magnetoimpedance under low fields for La 0.67 Sr 0.33 Mn 0.98 Co 0.02 O 3 sintered plates strongly depends upon the plate thickness. With an increase of sample thickness, the Magnetoimpedance increases and the frequency, where the maximum Magnetoimpedance occurs, shifts to low frequencies. A Giant Magnetoimpedance of −15.6% and a large AC magnetoresistance of −30.5% could be obtained under a very small field H = 600 Oe for the plate with a thickness of 3 mm.
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Giant Magnetoimpedance and permeability in nanocrystalline Fe–Nb–B ribbons
Materials Science and Engineering: A, 2007Co-Authors: Hongwei Qin, Juan Chen, Minhua JiangAbstract:Abstract In the present work, the Giant Magnetoimpedance of Fe83Nb6B11 annealed ribbons was investigated. The maximum Magnetoimpedance ΔZ/Z0 under longitudinal field H = 7162 A/m can reach −51.44% at an optimum annealing temperature of about 650 °C, where both the permeability and the change of permeability under transverse field show large values. The negative-magnetoreactance decreases with increasing frequency, accompanying the decrease of change ratio of permeability. In contrast, with an increase of frequency the negative-magnetoresistance undergoes a maximum, and then drops. The enhancement of the magnetoresistance at high frequency may be ascribed to the skin effect.
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Giant Magnetoimpedance in a MnZn ferrite
Journal of Magnetism and Magnetic Materials, 2006Co-Authors: Hongwei Qin, Minhua JiangAbstract:Abstract Giant Magnetoimpedance (GMI) effect has been observed in a MnZn ferrite at room temperature. The Magnetoimpedance Δ Z / Z 0 reaches −61.2% at a frequency f = 4 MHz under a field H = 3 kOe . The GMI in MnZn ferrite is connected not only with the field induced permeability variation, but also with the eddy current effect, high frequency loss and magnetic resonance.
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Giant Magnetoimpedance in as Quenched Fe Based Nanocrystalline Ribbons
Materials Science Forum, 2005Co-Authors: Hongwei Qin, Minhua Jiang, Dongliang Zhao, Dongling Wang, Xin Lin WangAbstract:FeCuNbSiB and FeZrBCu nanocrystalline ribbons can be obtained directly through the melt- spinning technique without additional annealing processes. The Giant Magnetoimpedance can be observed in FeCuNbSiB and FeZrBCu as quenched ribbons. The addition of Cu improves the nano-crystallization of a-Fe(Si) or a-Fe phase and reduces the grain size in FeCuNbSiB and FeZrBCu as quenched ribbons, which enhances the Magnetoimpedance via increasing the variation of permeability under fields. The present experimental results reveal a novel route to fabricate the Fe based nanocrystalline soft magnetic materials with Giant Magnetoimpedance effect.
Valentina Zhukova - One of the best experts on this subject based on the ideXlab platform.
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Giant Magnetoimpedance Microwires for Sensor Applications
AES20, 2020Co-Authors: Arkady Zhukov, P. Corte-león, Juan Maria Blanco, Mihail Ipatov, Lorena González-legarreta, Valentina ZhukovaAbstract:The influence of post-processing (annealing and stress-annealing) on the Giant Magnetoimpedance (GMI) effect in thin magnetic microwires is reviewed. High GMI effect has been observed in Co-rich magnetic microwires with vanishing magnetostriction coefficient. Post-processing including annealing or stress-annealing at adequate conditions allows further improvement of GMI effect in Co-rich magnetic microwires
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Routes for optimization of Giant Magnetoimpedance effect in magnetic microwires
IEEE Instrumentation & Measurement Magazine, 2020Co-Authors: Arcady Zhukov, P. Corte-león, Juan Maria Blanco, Mihail Ipatov, Lorena González-legarreta, Valentina ZhukovaAbstract:The objective of this report is to present the route of development of magnetically soft thin wires for applications in magnetic sensors. We present our experimental study of the Giant Magnetoimpedance (GMI) effect of magnetic microwires prepared using the Taylor-Ulitovsky technique. We observed that the GMI effect and magnetic softness of microwires can be tailored either by controlling magnetoelastic anisotropy of as-prepared microwires or by controlling their internal stresses and structure with heat treatment. High GMI effect has been observed and discussed.
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Giant Magnetoimpedance effect at GHz frequencies in amorphous microwires
AIP Advances, 2019Co-Authors: Arcady Zhukov, P. Corte-león, Mihail Ipatov, Lorena González-legarreta, J.m. Blanco, Valentina ZhukovaAbstract:Studies of magnetic properties and GMI effect of amorphous Co-Fe rich microwires reveal that they present GMI effect at GHz frequencies. Magnetic field dependences of GMI effect are affected by the post-processing conditions. In particular, we observed that in Co-Fe rich microwires stress-annealing allows improvement of frequency dependence of GMI ratio at high frequencies. We discussed observed experimental dependences considering both different magnetic structure and the anisotropy in the bulk and near the surface and close analogy between Giant Magnetoimpedance and ferromagnetic resonance.Studies of magnetic properties and GMI effect of amorphous Co-Fe rich microwires reveal that they present GMI effect at GHz frequencies. Magnetic field dependences of GMI effect are affected by the post-processing conditions. In particular, we observed that in Co-Fe rich microwires stress-annealing allows improvement of frequency dependence of GMI ratio at high frequencies. We discussed observed experimental dependences considering both different magnetic structure and the anisotropy in the bulk and near the surface and close analogy between Giant Magnetoimpedance and ferromagnetic resonance.
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Engineering of Giant Magnetoimpedance Effect in Co-rich Microwires by Joule heating
2018 International Conference on Electromagnetics in Advanced Applications (ICEAA), 2018Co-Authors: Arcady Zhukov, P. Corte-león, Juan Maria Blanco, Julian Gonzlez, Mihail Ipatov, Valentina ZhukovaAbstract:Joule heating of the Co-rich glass-coated microwire allows remakrable improvement of magnetic softness and Giant Magnetoimpedance effect. At optimal joule heating conditions we observed GMI ratio up to 650%, low magnetic anisotropy field of about 25 A/m and coercivity of about 2 A/m. Observed experimental dependencies are discussed considering various factors affecting the magnetic properties of studied microwire upon Joule heating: induced magnetic anisotropy, internal stresses relaxation and radial distribution of magnetic anisotropy.
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Surface magnetic properties and Giant Magnetoimpedance effect in Co-based amorphous ribbons
2017 IEEE International Magnetics Conference (INTERMAG), 2017Co-Authors: Alexander Chizhik, Valentina Zhukova, Mihail Ipatov, Arkady Zhukov, Victor Vega, Abd El-moez A. Mohamed, Victor M. Prida, T. Sánchez, B. Grande, L. DominguezAbstract:The Giant Magnetoimpedance effect (GMI) typically observed in soft magnetic materials has open new opportunities of research owing to the promising and, even nowadays, real technological applications [1].
Marcelo Knobel - One of the best experts on this subject based on the ideXlab platform.
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Dipolar-biased Giant Magnetoimpedance
Journal of Magnetism and Magnetic Materials, 2005Co-Authors: J.p. Sinnecker, Marcelo Knobel, A.e.p. De Araujo, R. Piccin, Manuel VázquezAbstract:Abstract The effect of the dipolar field on the Magnetoimpedance in Fe- and Co-based wires is presented. In the experiments a Co-based wire was used as a probe to measure the Giant Magnetoimpedance (GMI), while a Fe-based wire was employed to generate the dipolar field. The GMI curve showed a shift in the anisotropy field and a highly asymmetric profile. The dipole–dipole interaction can be employed to design novel linear GMI sensors and to properly tune their field operation.
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Recent experiments and models on Giant Magnetoimpedance
Physica B-condensed Matter, 2002Co-Authors: Kleber R. Pirota, Marcelo Knobel, Cristina Gomez-poloAbstract:An overview of the Giant Magnetoimpedance phenomenon is given in this work. The effect, that consists of drastic changes of the complex impedance of soft magnetic materials upon the application of an external magnetic field, has attracted attention owing to the increasing perspectives of applications on magnetic and stress sensor technology. In particular, asymmetric response is specially indicated for specific applications, and many experimental and theoretical results have been developed so far. A novel approach to investigate the GMI, based on the Fourier analysis of the time derivative of magnetization, will be discussed in further detail.
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Giant Magnetoimpedance: concepts and recent progress
Journal of Magnetism and Magnetic Materials, 2001Co-Authors: Marcelo Knobel, Kleber R. PirotaAbstract:The Giant Magnetoimpedance effect (GMI) consists in drastic changes of the complex impedance of soft magnetic materials upon the application of an external magnetic field. The GMI effect is strongly dependent on the frequency of the applied current and the magnetic anisotropies present in the material, among other factors, which spawn a number of interesting new magnetic phenomena. In this context, one can roughly separate the research on GMI into approximately three aspects: (i) theory; (ii) applications and (iii) as a tool to investigate other magnetic parameters. In this work, an updated review of all these aspects is given.
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Giant Magnetoimpedance in crystalline Mumetal
Solid State Communications, 1999Co-Authors: H. B. Nie, A. B. Pakhomov, X. Yan, Xixiang Zhang, Marcelo KnobelAbstract:We studied Giant Magnetoimpedance (GMI) effect in commercial crystalline Mumetal, with the emphasis to sample thickness dependence and annealing effects. By using appropriate heat treatment one can achieve GMI ratios as high as 310%, and field sensitivity of about 20%/Oe, which is comparable to the best GMI characteristics obtained for amorphous and nanocrystalline soft magnetic materials.
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Giant Magnetoimpedance in soft magnetic amorphous and nanocrystalline materials
Journal De Physique Iv, 1998Co-Authors: Marcelo KnobelAbstract:Recent results on Giant Magnetoimpedance (GMI) are reviewed. After a brief outline on the existent theories which explain the phenomenon, a general overview of experimental data on amorphous wires and ribbons is given. Furthermore, the GMI effect is observed in soft magnetic crystalline and nanocrystalline samples, and few investigations done in different systems are presented. To conclude, a recently observed effect in amorphous materials, the so-called Magnetoimpedance aftereffect, is reported and explained as a consequence of the relaxation of the circular magnetic permeability.
Mihail Ipatov - One of the best experts on this subject based on the ideXlab platform.
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Giant Magnetoimpedance Microwires for Sensor Applications
AES20, 2020Co-Authors: Arkady Zhukov, P. Corte-león, Juan Maria Blanco, Mihail Ipatov, Lorena González-legarreta, Valentina ZhukovaAbstract:The influence of post-processing (annealing and stress-annealing) on the Giant Magnetoimpedance (GMI) effect in thin magnetic microwires is reviewed. High GMI effect has been observed in Co-rich magnetic microwires with vanishing magnetostriction coefficient. Post-processing including annealing or stress-annealing at adequate conditions allows further improvement of GMI effect in Co-rich magnetic microwires
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Routes for optimization of Giant Magnetoimpedance effect in magnetic microwires
IEEE Instrumentation & Measurement Magazine, 2020Co-Authors: Arcady Zhukov, P. Corte-león, Juan Maria Blanco, Mihail Ipatov, Lorena González-legarreta, Valentina ZhukovaAbstract:The objective of this report is to present the route of development of magnetically soft thin wires for applications in magnetic sensors. We present our experimental study of the Giant Magnetoimpedance (GMI) effect of magnetic microwires prepared using the Taylor-Ulitovsky technique. We observed that the GMI effect and magnetic softness of microwires can be tailored either by controlling magnetoelastic anisotropy of as-prepared microwires or by controlling their internal stresses and structure with heat treatment. High GMI effect has been observed and discussed.
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Giant Magnetoimpedance effect at GHz frequencies in amorphous microwires
AIP Advances, 2019Co-Authors: Arcady Zhukov, P. Corte-león, Mihail Ipatov, Lorena González-legarreta, J.m. Blanco, Valentina ZhukovaAbstract:Studies of magnetic properties and GMI effect of amorphous Co-Fe rich microwires reveal that they present GMI effect at GHz frequencies. Magnetic field dependences of GMI effect are affected by the post-processing conditions. In particular, we observed that in Co-Fe rich microwires stress-annealing allows improvement of frequency dependence of GMI ratio at high frequencies. We discussed observed experimental dependences considering both different magnetic structure and the anisotropy in the bulk and near the surface and close analogy between Giant Magnetoimpedance and ferromagnetic resonance.Studies of magnetic properties and GMI effect of amorphous Co-Fe rich microwires reveal that they present GMI effect at GHz frequencies. Magnetic field dependences of GMI effect are affected by the post-processing conditions. In particular, we observed that in Co-Fe rich microwires stress-annealing allows improvement of frequency dependence of GMI ratio at high frequencies. We discussed observed experimental dependences considering both different magnetic structure and the anisotropy in the bulk and near the surface and close analogy between Giant Magnetoimpedance and ferromagnetic resonance.
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Engineering of Giant Magnetoimpedance Effect in Co-rich Microwires by Joule heating
2018 International Conference on Electromagnetics in Advanced Applications (ICEAA), 2018Co-Authors: Arcady Zhukov, P. Corte-león, Juan Maria Blanco, Julian Gonzlez, Mihail Ipatov, Valentina ZhukovaAbstract:Joule heating of the Co-rich glass-coated microwire allows remakrable improvement of magnetic softness and Giant Magnetoimpedance effect. At optimal joule heating conditions we observed GMI ratio up to 650%, low magnetic anisotropy field of about 25 A/m and coercivity of about 2 A/m. Observed experimental dependencies are discussed considering various factors affecting the magnetic properties of studied microwire upon Joule heating: induced magnetic anisotropy, internal stresses relaxation and radial distribution of magnetic anisotropy.
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Surface magnetic properties and Giant Magnetoimpedance effect in Co-based amorphous ribbons
2017 IEEE International Magnetics Conference (INTERMAG), 2017Co-Authors: Alexander Chizhik, Valentina Zhukova, Mihail Ipatov, Arkady Zhukov, Victor Vega, Abd El-moez A. Mohamed, Victor M. Prida, T. Sánchez, B. Grande, L. DominguezAbstract:The Giant Magnetoimpedance effect (GMI) typically observed in soft magnetic materials has open new opportunities of research owing to the promising and, even nowadays, real technological applications [1].
Arcady Zhukov - One of the best experts on this subject based on the ideXlab platform.
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Routes for optimization of Giant Magnetoimpedance effect in magnetic microwires
IEEE Instrumentation & Measurement Magazine, 2020Co-Authors: Arcady Zhukov, P. Corte-león, Juan Maria Blanco, Mihail Ipatov, Lorena González-legarreta, Valentina ZhukovaAbstract:The objective of this report is to present the route of development of magnetically soft thin wires for applications in magnetic sensors. We present our experimental study of the Giant Magnetoimpedance (GMI) effect of magnetic microwires prepared using the Taylor-Ulitovsky technique. We observed that the GMI effect and magnetic softness of microwires can be tailored either by controlling magnetoelastic anisotropy of as-prepared microwires or by controlling their internal stresses and structure with heat treatment. High GMI effect has been observed and discussed.
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Giant Magnetoimpedance effect at GHz frequencies in amorphous microwires
AIP Advances, 2019Co-Authors: Arcady Zhukov, P. Corte-león, Mihail Ipatov, Lorena González-legarreta, J.m. Blanco, Valentina ZhukovaAbstract:Studies of magnetic properties and GMI effect of amorphous Co-Fe rich microwires reveal that they present GMI effect at GHz frequencies. Magnetic field dependences of GMI effect are affected by the post-processing conditions. In particular, we observed that in Co-Fe rich microwires stress-annealing allows improvement of frequency dependence of GMI ratio at high frequencies. We discussed observed experimental dependences considering both different magnetic structure and the anisotropy in the bulk and near the surface and close analogy between Giant Magnetoimpedance and ferromagnetic resonance.Studies of magnetic properties and GMI effect of amorphous Co-Fe rich microwires reveal that they present GMI effect at GHz frequencies. Magnetic field dependences of GMI effect are affected by the post-processing conditions. In particular, we observed that in Co-Fe rich microwires stress-annealing allows improvement of frequency dependence of GMI ratio at high frequencies. We discussed observed experimental dependences considering both different magnetic structure and the anisotropy in the bulk and near the surface and close analogy between Giant Magnetoimpedance and ferromagnetic resonance.
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Engineering of Giant Magnetoimpedance Effect in Co-rich Microwires by Joule heating
2018 International Conference on Electromagnetics in Advanced Applications (ICEAA), 2018Co-Authors: Arcady Zhukov, P. Corte-león, Juan Maria Blanco, Julian Gonzlez, Mihail Ipatov, Valentina ZhukovaAbstract:Joule heating of the Co-rich glass-coated microwire allows remakrable improvement of magnetic softness and Giant Magnetoimpedance effect. At optimal joule heating conditions we observed GMI ratio up to 650%, low magnetic anisotropy field of about 25 A/m and coercivity of about 2 A/m. Observed experimental dependencies are discussed considering various factors affecting the magnetic properties of studied microwire upon Joule heating: induced magnetic anisotropy, internal stresses relaxation and radial distribution of magnetic anisotropy.
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Advances in Giant Magnetoimpedance of Materials
Handbook of Magnetic Materials, 2015Co-Authors: Arcady Zhukov, Mihail Ipatov, Valentina ZhukovaAbstract:Abstract The Giant Magnetoimpedance (GMI) effect consisting of the large change of both real and imaginary parts of the impedance upon the application of static magnetic field has attracted recent few years' considerable attention. An updated review on GMI was presented. The aim of the present work is to summarize and update the increasing number of information accumulated about the GMI effect and the recent progress on soft magnetic materials presenting GMI effect. After a short historical review, an overview of GMI is given, including a brief analysis of the phenomenology of GMI, overview of magnetic materials presenting GMI. Special emphasis on origin of the GMI hysteresis and applications is provided.
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Tailoring the High-Frequency Giant Magnetoimpedance Effect of Amorphous Co-Rich Microwires
IEEE Magnetics Letters, 2015Co-Authors: Arcady Zhukov, Mihail Ipatov, Ahmed Talaat, Valentina ZhukovaAbstract:We studied the Giant Magnetoimpedance (GMI) effect and magnetic properties of amorphous Co-rich magnetic microwires prepared by the Taylor-Ulitovski technique. The magnetic field dependence of impedance and the magnetic anisotropy fields can be tailored through the magnetoelastic anisotropy by controllable change of the internal stresses. Co-rich microwires exhibit high (above 300) GMI effect even at gigahertz frequencies. Features of the high-frequency GMI effect were analyzed using a ferromagnetic resonance-like approximation.