Interfacial Control via Reversible Ionic Motion in Battery-Like Magnetic Tunnel Junctions

Guofei Long, Qian Xue, Qiang Li, Yu Shi, Lin Li, Long Cheng, Peng Li, Junwei Zhang, Xixiang Zhang, Haizhong Guo, Jing Fu, Shandong Li, Jagadeesh S. Moodera, Guo-Xing Miao

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


Electrical control on interfaces is one of the key approaches to harvest advanced functionalities in modern electronic devices. In this work, it is proposed and demonstrated that a “battery-like” tunnel junction structure can be embedded with added control and functionalities via reversible lithium-ion motion. In a model system of FeCo/FeCoOx/LiF/FeCo magnetic tunnel junctions, the ultrathin LiF barrier makes strong electric fields possible under moderate applied voltages, and can therefore electrically drive reversible lithium-ion migration within the barrier. The ion motion subsequently leads to reversible interfacial modifications that generates over a thousand percent resistance change across the devices. Meanwhile, sizable tunneling magnetoresistance persists and even reverses the sign of spin polarization as a function of the interfacial control. The devices are therefore responsive to both electric and magnetic field manipulations, giving rise to diverse and nonvolatile functionalities.
Original languageEnglish (US)
Pages (from-to)2100512
JournalAdvanced Electronic Materials
StatePublished - Aug 8 2021

Bibliographical note

KAUST Repository Item: Exported on 2021-08-10
Acknowledgements: This work was supported by the Natural Sciences and Engineering Research Council of Canada (NSERC) Discovery Grant RGPIN-04178, the Ministry of Research, Innovation and Science (MRIS) Early Researcher Award, the National Natural Science Foundation of China (NSFC) Grant Nos. 11504192, 11674187, and 52001232, Shanghai Sailing Program (20YF1452000), the Shanghai Scientific and Technological Innovation Project (20ZR1460200) and the Fundamental Research Funds for the Central Universities. The work was also in part supported by the Canada First Research Excellence Fund. Work at MIT was supported by Army Research Office (W911NF-20-2-0061), the National Science Foundation (NSF-DMR 1700137), Office of Naval Research (N00014-20-1-2306) and Center for Integrated Quantum Materials (NSF-DMR 1231319) for financial support.


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