Magnetoresistance sensors

Current sensors Magnetoresistive Sensors Thin Film, MST P... 

Figure 1. Integrated head with an inductive writer and a shielded magnetoresistive sensor used in present longitudinal recording.

Figure 2. Sensing the stray field of a magnetic bead using a magnetoresistive sensor [93].

P.A. Lane, P.J. Wright, P.E. Oliver, C.L. Reeves, A.D. Pitt, and J.M. Keen, Growth of Iron, Nickel, and Permalloy Thin Pilms by MOCVD for use in Magnetoresistive Sensors, Chemical Vapor Deposition, Vol.3, 1997, pp.97-101. 

Keywords. Spin-Hall Effect />-type Bulk Semiconductors Magnetoresistive Sensors. 

Graham DL, Ferreira HA, Freitas PP, Cabral JM (2003) High sensitivity detection of molecular recognition using magnetically labelled biomolecules and magnetoresistive sensors. Biosens Bioelectron 18 483-488... 

Thin-film magnetoresistive sensors are prepared by processes similar to those used in microelectronics, so that it is reasonable to integrate AMR sensors with the evaluation circuit usually used in the bipolar CMOS technique. However, AMR sensors are usually offered in a simpler hybrid technology, in which both chips - sensor and electronics - can be fabricated by means of their optimized technology. Contamination risks and the large sensor size of about 1-2 mm2 normally make the production costs of one-chip solutions more costly. 

Magnetoresistive sensors can cover the whole spectrum of magnetic-field sensor applications, because they can detect both, the strength and the angle of the sensing field. In this section I explain their application as angle sensors. 

S. Tumanski, Thin Film Magnetoresistive Sensors, Institute of Physics Publishing,... 

Fig. 7.11.16 Angle measurement using an anisotropic magnetoresistance sensor (source Phi-lips/Bosch)...

Fig. 7.11.17 Anisotropic magnetoresistance sensor principle for 360° rotation (source Bosch)...

Figure 4. Detection of magnetic beads on 16 magnetoresistive sensor elements of the BARC chip. The noise level is determined by measuring the signal before beads are injected and after they are washed off [32].

Figure 12.14 Resistance vs. in-plane magnetic field curves at room temperature for electrodeposited (30 repeats) Co (2 nm)/Cu (3 nm) on conductive polypyrrole film (thickness 5 mm). (Reprinted with permission from Journal of Materials Chemistry, A flexible giant magnetoresistance sensor prepared completely by electrochemical synthesis by F. Van, G. Xue and F. Wan, 12, 2606-2608. Copyright (2002) Royal Society of Chemistry)...

Reiss G, Brueckl H, Huetten A, Schotter J, Brzeska M, Panhorst M, et al. Magnetoresistive sensors and magnetic nanoparticles for biotechnology. J Mater Res 2005 20 3294. 

Biosensors Using Magnetics, Rgure 1 Schematic of magnetically labeled biomolecule detection in a biosensor. Target biomolecules bound with a magnetic particle interact with magnetoresistive sensor-bound counter biomolecules to be detected... 

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