Abstract
Magnetic field sensors based on the giant magnetoresistance (GMR) effect have a number of practical current and future applications. We report on a modeling of the magnetoresistive response of moving spin-valve (SV) GMR sensors combined in certain cluster networks to an inhomogeneous magnetic field of a label. We predicted a large variety of sensor responses dependent on the number of sensors in the cluster, their types of interconnections, the orientation of the cluster, and the trajectory of sensor motion relative to the label. The model included a specific shape of the label, producing an inhomogeneous magnetic field. The results can be used for the optimal design of positioning devices.
Highlights
Magnetic field sensors based on various physical effects play an important role in modern science, industry, and everyday life
We report on a modeling of the magnetoresistive response of moving spin-valve (SV) giant magnetoresistance (GMR) sensors combined in certain cluster networks to an inhomogeneous magnetic field of a label
Spin-valve (SV) sensors are a type of magnetic field sensor based on the giant magnetoresistance (GMR) effect, discovered by two research groups led by Nobel Prize Laureates for Physics in 2007 Albert Fert [24] and Peter Grünberg [25]
Summary
Magnetic field sensors based on various physical effects play an important role in modern science, industry, and everyday life. A comprehensive review focused primarily on biological and medical applications of different types of magnetic field sensors is given in Murzin et al [2]. Spin-valve (SV) sensors are a type of magnetic field sensor based on the giant magnetoresistance (GMR) effect, discovered by two research groups led by Nobel Prize Laureates for Physics in 2007 Albert Fert [24] and Peter Grünberg [25]. The output signal of a SV sensor depends on the applied magnetic field via the angle φ between magnetizations of the free and pinned ferromagnetic layers of SV structure by (1-cosφ) law [27]. We consider linear movement of a macroscopic ((sub)-millimeter range) sensor in the form of the Wheatstone bridge with one or two point-size sensing elements in the inhomogeneous field of a magnetic label. The present results can be used for positioning magnetic objects in 3D space, and for label monitoring with a network of bridge clusters
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