Wang, JingpingChe, PingFeng, JingLu, MinfengLiu, JianfenMeng, JianHong, YuanjiaTang, Jinke2024-02-122024-02-122005-03-22https://wyoscholar.uwyo.edu/handle/internal/6259https://doi.org/10.15786/wyoscholar/9828Two channels of the conductance G exist in cold-pressed powder compacts of CrO2/(CrO2/Cr2O3), 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 (TMR) 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.enghttps://creativecommons.org/licenses/by/4.0/Physical Sciences and Mathematicsjournal contribution10.1063/1.1868080