Technology and Measurements of Magnetoresistance  in Thin-Layered Ferromagnetic Structures

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

Boiko

Drozdenko

Minárik

2022

AIP Advances

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Technology and measurements of three-layer NiFeCuMo/Ti/NiFeCuMo structures exhibiting the giant magnetoresistance phenomenon

Czarnacka

Kisała

Kociubiński

et al. 2022

Journal of Vacuum Science &Amp; Technology B

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Magnetoresistive phenomena are widely used in the construction of magnetic field sensors for biological, space, automotive, etc., applications. For this purpose, a number of methods of obtaining and testing this type of sensor are used. Therefore, the motivation to take up this topic is to obtain a structure showing magnetoresistance and carry out electrical measurements in a magnetic field to confirm the assumptions about the presence of magnetoresistance. This paper focuses on the technology and measurements of thin-film three-layer resistors. Structures NiFeCuMo/Ti/NiFeCuMo with 100/10/100 nm thicknesses were developed in situ using a DC magnetron sputtering method. A scanning electron microscopy or energy dispersive spectroscopy analysis was conducted on a sample structure and the target alloy to establish their chemical composition. The occurrence of the giant magnetoresistance exhibited by the developed three-layers was successfully confirmed in the presence of an applied magnetic field and the maximum value of resistance changes ΔR was approximately 2.75 Ω. Additionally, the thickness of the resistors was determined with a confocal microscope to verify the accuracy of the applied deposition method.

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Technology and Measurements of Magnetoresistance in Thin-Layered Ferromagnetic Structures

Cited by 2 publications

References 21 publications

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

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

Technology and measurements of three-layer NiFeCuMo/Ti/NiFeCuMo structures exhibiting the giant magnetoresistance phenomenon

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