Multiferroic tunnel junctions and ferroelectric control of magnetic state at interface (invited)
- Pennsylvania State Univ., University Park, PA (United States). Dept. of Physics
- King Abdullah Univ. of Science and Technology, Thuwal (Saudi Arabia). Physical Sciences and Engineering Division
- Univ. of Nebraska, Lincoln, NE (United States). Dept. of Physics and Astronomy. Nebraska Center for Materials and Nanoscience
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division
- Seoul National Univ. (Korea, Republic of). Dept. of Physics and Astronomy. IBS-Center for Functional Interfaces of Correlated Electron Systems
- Univ. of Science and Technology of China, Hefei (China). Dept. of Physics. Hefei National Lab. for Physical Sciences at Microscale
- Chinese Academy of Sciences (CAS), Shenyang (China). Shenyang National Lab. for Materials Science. Inst. of Metal Research
As semiconductor devices reach ever smaller dimensions, the challenge of power dissipation and quantum effect place a serious limit on the future device scaling. Recently, a multiferroic tunnel junction (MFTJ) with a ferroelectric barrier sandwiched between two ferromagnetic electrodes has drawn enormous interest due to its potential applications not only in multi-level data storage but also in electric field controlled spintronics and nanoferronics. In this paper, we present our investigations on four-level resistance states, giant tunneling electroresistance (TER) due to interfacial magnetoelectric coupling, and ferroelectric control of spin polarized tunneling in MFTJs. Coexistence of large tunneling magnetoresistance and TER has been observed in manganite/(Ba, Sr)TiO3/manganite MFTJs at low temperatures and room temperature four-resistance state devices were also obtained. To enhance the TER for potential logic operation with a magnetic memory, La0.7Sr0.3MnO3/BaTiO3/La0.5Ca0.5MnO3 /La0.7Sr0.3MnO3 MFTJs were designed by utilizing a bilayer tunneling barrier in which BaTiO3 is ferroelectric and La0.5Ca0.5MnO3 is close to ferromagnetic metal to antiferromagnetic insulator phase transition. The phase transition occurs when the ferroelectric polarization is reversed, resulting in an increase of TER by two orders of magnitude. Finally, tunneling magnetoresistance can also be controlled by the ferroelectric polarization reversal, indicating strong magnetoelectric coupling at the interface.
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); Natural Science Foundation of China (NSFC); National Basic Research Program of China (NBRPC); Fundamental Research Funds for the Central Universities (FRFCU) (China)
- Grant/Contract Number:
- AC05-00OR22725; FG02-08ER4653; DMR-1207474; DMR-1411166; DMR-DMR-0820521; 2015CB921201; WK2030020026
- OSTI ID:
- 1265591
- Journal Information:
- Journal of Applied Physics, Vol. 117, Issue 17; ISSN 0021-8979
- Publisher:
- American Institute of Physics (AIP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Similar Records
Octonary resistance states in La0.7Sr0.3MnO3/BaTiO3/La0.7Sr0.3MnO3 multiferroic tunnel junctions
Nonvolatile Multilevel States in Multiferroic Tunnel Junctions