Spin-transfer-induced magnetization switching processes are evidenced by the "snapshots" of magnetic configurations for junctions containing nanocurrent channels (NCCs). The switching behaviors are found to be closely related to the NCC size and its actual location. Both the switching time t and critical current density Jc decrease with the increase of NCC size. Faster switching and lower Jc are observed for NCC located in the center. This work suggests a reasonable design frame to efficiently manipulate the Jc reduction and fast switching in practical spin-transfer-switched devices.
Bibliographical noteFunding Information:
This work was supported by the National Natural Science Foundation of China (Grant Nos. 10604016, 60678008, 10404019 and 60490290) and by the Science and Technology Committee of Shanghai (Nos. 05PJ14016, 05PJ14090 and 06DJ14007). The simulation work was supported by Fudan National High Performance Computing Center.
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