期刊
PHYSICAL REVIEW APPLIED
卷 15, 期 5, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevApplied.15.054055
关键词
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资金
- Swiss National Science Foundation [200020172775]
- Swiss Government Excellence Scholarship [2018.0056]
- ETH Zurich [SEED-1416-2]
- Industrial Affiliation Program on MRAM devices of the Interuniversity Microelectronics Centre (IMEC)
This study systematically investigates the impact of dual voltage pulses on the switching performance of three-terminal magnetic tunnel junctions (MTJs) designed for field-free switching by spin-orbit torques (SOTs). Experimental results and micromagnetic modeling show that different effects play a lead role in assisting SOTs in the magnetization-reversal process depending on the pulse duration and MTJ diameter. A compact model is presented to evaluate the impact of each effect due to the MTJ bias on the critical switching parameters.
We use three-terminal magnetic tunnel junctions (MTJs) designed for field-free switching by spin-orbit torques (SOTs) to systematically study the impact of dual voltage pulses on the switching performance. We show that the concurrent action of an SOT pulse and an MTJ bias pulse allows for reducing the critical switching energy below the level typical of spin-transfer-torque while preserving the ability to switch the MTJ on the subnanosecond time scale. By performing dc and real-time electrical measurements, we discriminate and quantify three effects arising from the MTJ bias: the voltage-controlled change of the perpendicular magnetic anisotropy, current-induced heating, and the spin-transfer torque. The experimental results are supported by micromagnetic modeling. We observe that, depending on the pulse duration and the MTJ diameter, different effects take a lead in assisting the SOTs in the magnetization-reversal process. Finally, we present a compact model that allows for evaluating the impact of each effect due to the MTJ bias on the critical switching parameters. Our results provide input to optimize the switching of three-terminal devices as a function of time, size, and material parameters.
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