Chapter Three Magnetic Sensors: Principles and Applications

Cabrera

et al. 2015

Sensors

100

Currently there are many types of sensors that are used in lots of applications. Among these, magnetic sensors are a good alternative for the detection and measurement of different phenomena because they are a “simple” and readily available technology. For the construction of such devices there are many magnetic materials available, although amorphous ferromagnetic materials are the most suitable. The existence in the market of these materials allows the production of different kinds of sensors, without requiring expensive manufacture investments for the magnetic cores. Furthermore, these are not fragile materials that require special care, favouring the construction of solid and reliable devices. Another important feature is that these sensors can be developed without electric contact between the measuring device and the sensor, making them especially fit for use in harsh environments. In this review we will look at the main types of developed magnetic sensors. This work presents the state of the art of magnetic sensors based on amorphous ferromagnetic materials used in modern technology: security devices, weapon detection, magnetic maps, car industry, credit cards, etc.

“…Therefore, a mechanical stress will cause a change in the susceptibility of the material that can be used to measure stress, strain, torques, forces, etc. [ 9 ].…”

Section: Sensors Based On Magnetostrictive Effectsmentioning

confidence: 99%

Magnetic Sensors Based on Amorphous Ferromagnetic Materials: A Review

Cabrera

et al. 2015

Sensors

100

Журнал Технической Физики

“…В многослойных пленочных структурах были получены чувствительности до 300%/Oe [1,2]. Кроме того, технологии их получения совместимы с методами производства компонент полупроводниковой электроники [3]. Пермаллой FeNi удовлетворяет обязательным условиям для наблюдения значительного магнитоимпедансного эффекта: высокой магнитной проницаемостью, низкой коэрцитивной силой и возможностью создания одноосной магнитной анизотропии [2][3][4].…”

Section: Introductionunclassified

“…Кроме того, технологии их получения совместимы с методами производства компонент полупроводниковой электроники [3]. Пермаллой FeNi удовлетворяет обязательным условиям для наблюдения значительного магнитоимпедансного эффекта: высокой магнитной проницаемостью, низкой коэрцитивной силой и возможностью создания одноосной магнитной анизотропии [2][3][4]. ГМИ обусловлен изменением глубины скин-слоя ферромагнитного проводника при приложении постоянного внешнего магнитного поля вследствие изменения эффективной магнитной проницаемости.…”

Section: Introductionunclassified

Магнитный Импеданс Пленочных Наноструктур Для Оценки Полей Рассеяния Микрочастиц Магнитных Композитов

Мельников¹,

Лепаловский²,

Курляндская³

2022

Longitudinal giant magnetoimpedance effect of [Fe21Ni79/Cu]5/Cu/[Fe21Ni79/Cu]5 film element was investigated depends on stray magnetic field of epoxy magnetic composite with 30 % weight concentration of iron oxide magnetic microparticles. Configuration of an experiment was a model of thrombus detection in a blood vessel. Stray magnetic field was varied by movement of a magnetic composite above the element perpendicular to the long side. Composite was either magnetized or not to the state of remanence. As the magnetic composite approaches the GMI element, MI ratio curves are smoothed and shifted along the field axis and maximum value of the MI ratio decreases. Magnetic properties of magnetic composite and film element were investigated as well.

“…Fluxgate sensors are vector magnetometers with a wide range of resolutions from pT to mT. As the most sensitive magnetometer technology that does not require extensive cryogenics they are used for geomagnetic surveys, mineral exploration, aerospace and defense as well as medical applications [1]. However, their bulky nature makes such sensors unfeasible for many industrial applications like magnetic position and orientation detection.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Single- and Double Core Planar Fluxgate Structures

et al. 2018

The planar fluxgate is an emerging technology feasible for system integration contrary to it’s bulky 3D counterpart. Recently, a novel structure based on an asymmetric double core layout for improved sensitivity and energy efficiency was proposed. The aim of this paper is, for the first time, to conduct a direct experimental comparison between single- and asymmetric double-core structures. The results confirm the original conjecture and show that asymmetric double core structures can easily boost the sensitivity by a factor of two for similar power supply.