Single-shot dynamics of spin–orbit torque and spin transfer torque switching in three-terminal magnetic tunnel junctions
| Autor: | Gouri Sankar Kar, Sebastien Couet, Pietro Gambardella, Farrukh Yasin, Kevin Garello, Eva Grimaldi, Giacomo Sala, Viola Krizakova |
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| Rok vydání: | 2020 |
| Předmět: |
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Materials science Biomedical Engineering Nucleation FOS: Physical sciences Bioengineering 02 engineering and technology 010402 general chemistry 01 natural sciences Switching time Mesoscale and Nanoscale Physics (cond-mat.mes-hall) Torque General Materials Science Electrical and Electronic Engineering Physics Condensed Matter - Materials Science Magnetization dynamics Condensed Matter - Mesoscale and Nanoscale Physics Condensed matter physics Dynamics (mechanics) Spin-transfer torque Materials Science (cond-mat.mtrl-sci) 021001 nanoscience & nanotechnology Condensed Matter Physics Atomic and Molecular Physics and Optics 0104 chemical sciences Tunnel magnetoresistance Magnetic anisotropy Probability distribution Transient (oscillation) 0210 nano-technology Random access |
| Zdroj: | Nature Nanotechnology, 15 (2) |
| ISSN: | 1748-3395 1748-3387 |
| DOI: | 10.1038/s41565-019-0607-7 |
| Popis: | Current-induced spin-transfer torques (STT) and spin-orbit torques (SOT) enable the electrical switching of magnetic tunnel junctions (MTJs) in non-volatile magnetic random access memories. To develop faster memory devices, an improvement in the timescales that underlie the current-driven magnetization dynamics is required. Here we report all-electrical time-resolved measurements of magnetization reversal driven by SOT in a three-terminal MTJ device. Single-shot measurements of the MTJ resistance during current injection reveal that SOT switching involves a stochastic two-step process that consists of a domain nucleation time and propagation time, which have different genesis, timescales and statistical distributions compared to STT switching. We further show that the combination of SOT, STT and the voltage control of magnetic anisotropy leads to reproducible subnanosecond switching with the spread of the cumulative switching time smaller than 0.2 ns. Our measurements unravel the combined impact of SOT, STT and the voltage control of magnetic anisotropy in determining the switching speed and efficiency of MTJ devices. |
| Databáze: | OpenAIRE |
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