10.- Spin Polarized Tunneling (Giant Magnetoresistance)
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Uploaded by SpinningParticle on Dec 26, 2008
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Spin Polarized Tunneling (Giant Magnetoresistance)
It is the effect produced by an external magnetic field in the behavior of an electric current with a potential barrier.
The potential prevents the crossing of the electrons so that the material shows a great (almost infinite) resistivity.
If we introduce an external magnetic field,orthogonal to the direction of the current,...
...the conduction electrons become transversally polarized and, therefore,...
...they cross the barrier by the previous tunneling effect,...
...which does not work if the electrons are unpolarized.
The resistivity is highly decreased by polarizing the electrons.
These materials are named Giant Magnetoresistive materials.
The resistivity is changed by an external magnetic field.
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