Magnetoresistive sensors Invent at 1856 William Thompson Lord Kelvin.

Magnetoresistive sensors

Invent at 1856

William Thompson

Lord Kelvin


All types

Anisotropic Magnetoresistive (AMR)

Giant Magnetoresistive (GMR)

Colossal Magnetoresistance (CMR)


Theory of AMR


Theory of AMR

2cos

Barber Pole Bias


Theory of AMR


Operation of AMR


Operation of AMR (HMC1501)














Typical application

Cylinder position sensing in pneumatic cylinders Elevator sensor Lid sensor for laptop computers Position sensor for materials handling equipment

(lift trucks) Blood analyzer Magnetic encoders


Comparision of Hall effect & MR technologies


Giant Magnetoresistive (GMR)

Observe at 1988 Magnetoresistivity > 70%


Giant Magnetoresistive (GMR) - Theory


Giant Magnetoresistive (GMR) - Application

Proximity Detection Displacement Sensing Rotational Reference Detection

Colossal Magnetoresistive (CMR)

Observe at 1988 Magnetoresistivity > 1000% ~ 10000000%


Comparison

Magnetoresistive sensors Invent at 1856 William Thompson Lord Kelvin.

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