HUGE MAGNETORESISTANCE IN NONCONJUGATED POLYMERS
There are several publications about magnetoresistance in conjugated organic materials. But its results do not meet the requirements of practical approach due to small magnitude of the magnetoresistance coefficient. This article is an overview of the investigation of huge magnetoresistance in the structure of ferromagnetic / nonconjugated polymer / nonmagnetic metal. The maximum value of the magnetoresistance coefficient was 107%. Consideration is given to the influences of magnetostriction, thickness of the polymer film and electrode material on the huge magnetoresistance. Charge transfer is considered from the standpoint of the injection model. It is revealed that there are two mechanisms of conductivity changing in the ferromagnetic / non-conjugated polymer / nonmagnetic metal structure due to the magnetic field: changing potential barrier at the ferromagnetic / polymer interface and changing charge mobility in the narrow conductivity sub-band of the polymer.