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Large low-field tunneling magnetoresistance of CrO2/(CrO2∕Cr2O3) powder compact with two coercivities, A
Wang, Jingping Che, Ping Feng, Jing Lu, Minfeng Liu, Jianfen Meng, Jian Hong, Yuanjia Tang, Jinke
Wang, Jingping
Che, Ping
Feng, Jing
Lu, Minfeng
Liu, Jianfen
Meng, Jian
Hong, Yuanjia
Tang, Jinke
Abstract
Description
Two 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.
Date
2005-03-22
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University of Wyoming. Libraries
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Keywords
Physical Sciences and Mathematics