Multi‐State Magnetic Tunnel Junction Programmable by Nanosecond Spin‐Orbit Torque Pulse Sequence

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Multi‐State Magnetic Tunnel Junction Programmable by Nanosecond Spin‐Orbit Torque Pulse Sequence
Title:
Multi‐State Magnetic Tunnel Junction Programmable by Nanosecond Spin‐Orbit Torque Pulse Sequence
Other Titles:
Advanced Electronic Materials
Publication Date:
15 March 2021
Citation:
Lourembam, J., Huang, L., Chen, B., Qiu, J., Chung, H. J., Yap, S. L. K., Yap, Q. J., Wong, S. K., Lim, S. T., Multi-State Magnetic Tunnel Junction Programmable by Nanosecond Spin-Orbit Torque Pulse Sequence. Adv. Electron. Mater. 2021, 7, 2001133. https://doi.org/10.1002/aelm.202001133
Abstract:
Multi-state spin-orbit torque (SOT) switching, particularly in magnetic tunnel junction (MTJ) geometry, is promising hardware for artificial intelligence due to its potential to form artificial neurons and to increase storage density per bit. Here, multi-state switching is demonstrated in Pt/Co40Fe40B20/MgO-based elliptical MTJ, fabricated on a 200 mm wafer platform, using nanosecond spin-orbit torque pulses. Multi-state switching is achieved using MTJs composed of a single ferromagnetic storage layer and without resorting to any domain-wall pinning step. The genesis of the multi-states, rather than the expected bistable states in MTJs, come from the formation and stabilization of metastable domains by the voltage pulse. The persistence and the probability of the mid-states are investigated by two different spin-orbit torque pulse sequences. Additionally, it is reported that size (>domain-wall width), exchange constant (<20 × 10−12 J m-1), current density amplitude (≈threshold values), and pulse sequence are important considerations for realizing multi-state SOT MTJs. These industry-grade MTJs can be leveraged to accelerate the development of spintronics-based neuromorphic devices.
License type:
Publisher Copyright
Funding Info:
This research / project is supported by the A*STAR - Spin-Orbit Technologies for Intelligence at the Edge
Grant Reference no. : A18A6b0057
Description:
This is the peer reviewed version of the following article: Lourembam, J., Huang, L., Chen, B., Qiu, J., Chung, H. J., Yap, S. L. K., Yap, Q. J., Wong, S. K., Lim, S. T., Multi-State Magnetic Tunnel Junction Programmable by Nanosecond Spin-Orbit Torque Pulse Sequence. Adv. Electron. Mater. 2021, 7, 2001133. https://doi.org/10.1002/aelm.202001133, which has been published in final form at https://doi.org/10.1002/aelm.202001133. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited.
ISSN:
2199-160X
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