Ultrafast voltage-induced switching enabled by coupling dynamics in perpendicular magnetic tunnel junction
Abstract
Ultrafast magnetization switching is essential for spintronic applications, yet the switching speed of current-driven approaches such as spin-transfer torque and spin–orbit torque is fundamentally limited by magnetic damping. Here, we demonstrate voltage-driven switching in perpendicular magnetic tunnel junctions with an exchange-coupled free layer, combining voltage-controlled magnetic anisotropy and voltage-controlled exchange coupling. We achieve unidirectional reversal with a 50% probability within 87.5 ps, establishing the sub-100-ps capability of voltage-induced switching. Analysis of switching probability vs pulse width reveals an intrinsic size-dependent switching efficiency, which is enhanced as device dimensions decrease. This trend reflects the role of coupling dynamics as confirmed by macrospin simulations, establishing coupling dynamics as the key enabler of ultrafast voltage-driven switching.
Article Details
Journal Info
Applied Physics Letters
American Institute of Physics
Authors (7)
Qi Jia
Yu-Chia Chen
Yang Lv
State Key Laboratory of Coordination Chemistry, Key Laboratory of Mesoscopic Chemistry of MOE, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering
Delin Zhang
Shuang Liang
State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry
Yifei Yang
Key Laboratory of Ocean Observation and Forecasting, Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences
Jian-Ping Wang
Department of Electrical and Computer Engineering, University of Minnesota 1 , Twin Cities, Minneapolis, Minnesota 55455,