Principles of Magnetoresistive Elements

Magnetoresistance Effect

• How to Calculate the Magnetoresistance Effect
• Magnetoresistance Effect Models

When a magnetic field is applied in a direction perpendicular to the InSb plate surface, the resistance will be raised. This is called the magnetoresistance effect, and depends on the electron mobility of the material.

How to Calculate the Magnetoresistance Effect

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Magnetoresistance Effect Models

Current mode under non-magnetic field

Current mode under magnetic field

• If magnetic flux (magnetic field) is not applied, the current flows straight through the InSb plate. However, if magnetic flux is applied, a Lorentz force proportional to the magnetic flux density will deflect the current path.
• As the current path is deflected, the current flows through the plate for a longer distance, causing the resistance to be increased.

Lorentz force (F) = qV x B

q: Electric charge (Coulombs)
V: Rate vector (m/s)
B: Magnetic flux density (Wb/m²)

"When charged particles travel through a magnetic flux, a force proportional to the traveling rate and magnetic flux density is applied to the particles in a direction perpendicular to both the rate vector and direction of the magnetic flux."

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Principles of Magnetoresistive Elements