High sensitivity linear position sensor developed using granular Ag–Co giant magnetoresistances

Abstract. The Giant MagnetoResistance (GMR) effect is a magnetic coupling mechanism that can be obtained in multilayer structures of few nanometers thick. In these devices, and at room temperature, the resistance is a function of the external magnetic field, at optimal levels for being used as sensors. Since the GMR effect was reported, scientists and engineers have dedicated their effort to this topic. This way, after two decades, a a very good knowledge of the GMR underlying physics together with notable designs of GMR based devices are nowadays available. They were initially used in the read heads of hard drives, but the constant evolution that this technology has experienced has open new fields of application, mainly related to the measurement of small magnetic fields using miniaturized devices, such as biotechnology and microelectronics.Regarding the microelectronics case, these sensors can be potentially used in those scenarios that require a detection or measurement of nonintrusive power by the indirect measurement of the magnetic field.In this chapter, an overview to the current research regarding the application of GMR sensors in the measurement of electrical currents at the integrated circuit (IC) level is drawn. In this particular case is important to take account of particular parameters of the GMR devices such as the sensing structures, the geometric arrangement and implementation of the sensors, the considered linear range, undesired couplings, biasing, hysteresis, temperature drifts, ... We have also described some cases of success describin particular applications of these devices. Finally, some aspects related to the monolithic integration of GMR devices onto standard CMOS engineered chips are also considered in this chapter.

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“…These interfaces are also found in granular alloys [11]. These later structures also have been successfully used in sensing applications [12].…”

Section: Sensing Structuresmentioning

confidence: 84%

GMR Based Sensors for IC Current Monitoring

Reig

Cubells-Beltrán

2013

Giant Magnetoresistance (GMR) Sensors

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“…Magnetic fields have also been employed in order to accurately control in a non-contact way some machinery tools or medical instrumentation (Schlageter et al, 2001); (Kosel et al, 2005); (Arana et al, 2005). The distances covered in these cases range from a few millimetres to several tenths of centimetres.…”

Section: Fig 1 Position Estimation Using the Triangulation Methodsmentioning

confidence: 99%

A Sensors System for Indoor Localisation of a Moving Target Based on Infrared Pattern Recognition

Petrellis¹,

Konofaos²,

Alexiou³

2007

Scene Reconstruction Pose Estimation and Tracking

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“…Magnetic properties of transition metals can be altered and their stability can be improved by alloying them with noble metals. Nanocrystalline Fe-Cu, Fe-Ag, Co-Ag, etc., exhibit higher anisotropy and hence show greater GMR [1][2][3][4]. At the same time, systems like Fe-Ag and Co-Ag are thermally immiscible as per their phase diagrams under equilibrium conditions [5,6].…”

Section: Introductionmentioning

confidence: 99%