Magnetoresistance in Granular Metal–Dielectric Composites

Samedova, U. F.; Hasanli, Sh. M.

doi:10.3103/s1068375518020114

Cited by 3 publications

(1 citation statement)

References 17 publications

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“…In summary, the non-destructive testing method of reluctance measurement is based on the physical environment of a closed magnetic circuit. The path of magnetic flux always concentrates and passes through a medium with low reluctance [11]. As shown in Fig.…”

Section: Model Construction and Application A Model Constructionmentioning

confidence: 97%

Research on Detection Method of Small Size Weld Bead Defects Based on Reluctance Measurement

Wang

2019

IEEE Access

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To achieve non-destructive testing for small size weld beads of metal workpieces, we developed a new testing method of closed magnetic circuit reluctance measurement. According to the shape and volume of the small size weld defects of the metal workpiece, a reluctance detection model was established in the detection environment of alternating magnetic field. The relationship between different weld defects and closed magnetic circuit reluctance was quantitatively analyzed to achieve the identification of weld defects. A particle swarm optimization algorithm (PSO) was applied to optimize the cost-sensitive support vector machine (CS-SVM), which effectively reduced the coupling errors caused by the limitation of the workpiece coupling size. This new method was used to verify the weld bead detection of representative carbide saw blades. Compared with the basic support vector machine, the improved cost-sensitive support vector machine has better performance in the classification of unbalanced samples. The experimental results showed this new method can detect the weld bead of carbide saw blade with the correct rate to 98.2%. It reduced the interference of coupling error effectively. The improved cost-sensitive support vector machine not only improved the detection accuracy, but also avoided the possibility that the defective weld workpiece samples are misclassified into qualified workpieces. This study provides a guarantee for safe production and has great significance in engineering applications. The new method provides an effective solution for the application of reluctance testing technology in small size weld bead detection. INDEX TERMS Closed magnetic circuit, cost-sensitive support vector machine, coupling error, particle swarm optimization, reluctance measurement, small size weld bead.

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Section: Model Construction and Application A Model Constructionmentioning

confidence: 97%

Research on Detection Method of Small Size Weld Bead Defects Based on Reluctance Measurement

Wang

2019

IEEE Access

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An investigation on the novel granular composite of Co2FeSi Heusler alloy with Mn and Al2O3: Structural and magnetic properties

Talaeizadeh

Jamilpanah

Ebrahimi

et al. 2022

Physica B: Condensed Matter

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Dielectric properties, polarization process, and charge transport in granular (FeCoZr)x(Pb(ZrTi)O3)(100−x) nanocomposites near the percolation threshold

2022

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This paper presents the research of dielectric properties of (FeCoZr)x(Pb(ZrTi)O3)(100−x) granular metal–dielectric nanocomposites below the percolation threshold. Tested materials have been prepared by using the ion beam sputtering technique in the atmosphere of argon and oxygen. The impedance spectroscopy method has been used to investigate the polarization processes and dielectric relaxation mechanism in the granular nanocomposites. AC measurements in the frequency region of 50 Hz to 1 MHz and measuring temperature range of 81–293 K have been performed. Interfacial, in the low frequency region, and dipolar, in intermediate and high frequency regions, types of polarization processes were observed. The interfacial relaxation process testifies to charge accumulation at the interfaces (grain boundaries) between conductive nanoparticles surrounding an insulative matrix, as well as the space charge region around the contact area between the measurement probes and tested sample. Dipolar polarization corresponds to electric dipole formation after applying to the material an external electric field. The conduction mechanism in the tested material is considered to be hopping carrier exchange and takes place between metallic phase nanograins. It corresponds to the exponential frequency dependence of conductivity. The relaxation mechanism in the (FeCoZr)x(Pb(ZrTi)O3)(100−x) layer has been estimated as a near-Debye process with relaxation time distribution. The nanocomposite exhibits dielectric type and capacitive characteristics in the whole measuring frequency range.

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Magnetoresistance in Granular Metal–Dielectric Composites

Cited by 3 publications

References 17 publications

Research on Detection Method of Small Size Weld Bead Defects Based on Reluctance Measurement

Research on Detection Method of Small Size Weld Bead Defects Based on Reluctance Measurement

An investigation on the novel granular composite of Co2FeSi Heusler alloy with Mn and Al2O3: Structural and magnetic properties

Dielectric properties, polarization process, and charge transport in granular (FeCoZr)x(Pb(ZrTi)O3)(100−x) nanocomposites near the percolation threshold

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