Document Type

Article

Publication Date

3-22-2005

Abstract

Two channels of the conductance G exist in cold-pressed powder compacts of CrO2/sCrO2/Cr2O3d, where two types of granules have different coercivities. One of the channels is the spin-dependent intergranular tunneling conductance, and the other one is the spin-independent higher-order inelastic hopping conductance. The conductance is mainly related with the spin-dependent tunneling channel at low temperature. A large low field tunneling magnetoresistance sTMRd of 30.4% is achieved in 950 Oe field at 2 K. The reason is the relative orientation of the magnetization that tends to be antiparallel between the two coercivities. Field dependence of the tunneling magnetoresistance shows two better-separated peaks than that of CrO2 powder compact. The results suggest that the introduction of CrO2/Cr2O3 improves low field sensitivity, TMR, and switching characteristics. © 2005 American Institute of Physics.

DOI

10.1063/1.1868080

Comments

Copyright 2005 AIP (American Institute of Physics) Publishing LLC.

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