Giant Magnetoresistance in the Polymer-Ferromagnetic System

Abstract

A new magnetoresistance phenomenon is observed in a magnetic—polymer—non-magnetic metal multilayer structure. For the first time, giant magnetoresistance is obtained on the ferromagnetic- poly(arylenephthalide) boundary and can be switched on and off by varying the external magnetic field. We present the results of researches of the ferromagnet—polymer—non-magnetic metal system that has all above-mentioned properties at room temperature. The magnetoresistance is extremely large, so the working cell resistance changes at least by 10⁴ times. The current-voltage characteristics of the magnetic—polymer—Cu structure with giant magnetoresistance ‘on’ confirm the influence of the magnetic field on the system.

Keywords:

• fermi level
• giant magnetoresistance
• polymer film

PACS:

• 75.47.De

Acknowledgments

This work was supported by RFBR grants: No 05-03-34827-MF and 05-02-17321 and by Programs of Russian Academy of Sciences “P-8” and “OFN-5.”