Reduction in critical current density for spin torque transfer switching with composite free layer

Cheng-Tyng Yen; Wei-Chuan Chen; Ding-Yeong Wang; Yuan-Jen Lee; Chih-Ta Shen; Shan-Yi Yang; Ching-Hsiang Tsai; Chien-Chung Hung; Kuei-Hung Shen; Ming-Jinn Tsai; Ming-Jer Kao
September 2008
Applied Physics Letters;9/1/2008, Vol. 93 Issue 9, p092504
Academic Journal
A composite free layer (CFL) consisting of a soft layer and a hard layer exchange coupled in parallel is proposed. The experimental results showed that the critical current density (Jc) can be reduced from 7.05×106 A/cm2 of strong coupled CoFeB(12.5 Å)/Ru(4 Å)/NiFe(17.5 Å) CFL to 2.65×106 A/cm2 of weak coupled CoFeB(12.5 Å)/Ru(15 Å)/NiFe(17.5 Å) CFL. The macrospin simulations showed that the soft layer of CFL can assist the hard layer of CFL to switch at a lower Jc. These results suggest that by using CFL, it is possible to reduce the Jc of spin torque transfer switching without compromising the thermal stability.


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