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We report on current-induced magnetization switching in a nanomagnet with perpendicular anisotropy, and investigate the effects of the damping constant () on the switching current ( ) by varying the nanosecond-scale pulse current duration ( ), the saturation magnetization ( ), and the magnetocrystalline anisotropy ( ). The results show that reduction of below a certain threshold ( ) is ineffective in reducing for short . When is short, it is necessary to reduce both and simultaneously until is reached to reduce . The results presented here offer a promising route for the design of ultrafast information storage and logic devices using current-induced magnetization switching.


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