Academic literature on the topic 'Magnetosensitive element'

Spin valves with a synthetic antiferromagnet were fabricated via magnetron sputtering. It was shown that the fabricated spin valve layers had a perfect microstructure and smooth interfaces, and therefore, an RKKY interaction dominated in the coupling of the ferromagnetic layers separated by a copper spacer. Rhombus-shaped micro-objects were fabricated from a single spin valve film. The thermomagnetic treatment procedure was found to form unidirectional anisotropy in the micro-object such that the values of the exchange bias fields in the rhombus’ nonparallel sides were opposite in sign. For the CoFeNi/Ru/CoFeNi synthetic antiferromagnet, we determined the differences between the ferromagnetic layer thicknesses at which the thermomagnetic treatment formed the same exchange bias all over each rhombus’ side. We also fabricated a sensor element in which each side of the rhombus was the shoulder of a Wheatstone bridge. After the thermomagnetic treatment procedure, each shoulder worked as an active magnetosensitive element, enabling the device to operate as a full Wheatstone bridge. The sensor output exhibited a step shape, high sensitivity to field changes, and significant magnetic hysteresis. Such characteristics are suitable for switching devices.

The article presents an electric current sensor built of a fiber-optic differential interferometer using the Faraday effect in a single-mode fiber. It was applied to measure current waveforms with large amplitudes and mains frequency. The optical sensor does not introduce additional resistance and inductance into the measured circuit, which is a desirable phenomenon in this type of measurements. The magnetosensitive element is an optical fiber coil made of a quartz single-mode telecommunications fiber. The optical fiber, in which the core is twisted around its axis, is characterized by a small influence of disturbing quantities, i.e., mechanical vibrations and pressure changes, on the working of the differential interferometer by inducing linear birefringence in the glass fiber. The methods of elimination of the quantities influencing the operation of the optical fiber current sensor were proposed by reducing the linear birefringence induced in the optical fiber from these quantities. The dependence of the normalized light intensity was plotted. The results of experimental research on a design solution of a differential interferometer based on the Faraday effect, operating at a wavelength of 1550 nm, are presented. The sensor was used for measurements of sinusoidal current with a frequency of 50 Hz and amplitudes ranging 100–1500 A. The uncertainty of measurement of the electric current amplitude was determined in the range of the measured values, which was estimated at no more than 1.5 %.

In this work the results of substrate temperature effects on coercivity and magnetoresistance in ferromagnetic structures are shown. It was found that with an increase of the substrate temperature from 270 to 390 °C the magnetoresistance increases from 1.2 to 2.3% and the coercive force from 1.6 to 5.3 Oe. A new topology of anisotropic magnetoresistive structures is proposed. In these structures the shape of ferromagnetic elements repeats the shape of nonmagnetic conducting shunts. Sensitivity values obtained for both types of magnetic structures are compared.