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Title: Multiferroic tunnel junctions and ferroelectric control of magnetic state at interface (invited)

Journal Article · · Journal of Applied Physics
DOI:https://doi.org/10.1063/1.4913753· OSTI ID:1265591
 [1];  [1];  [2];  [3];  [4];  [4];  [4];  [5];  [5];  [3];  [6];  [7];  [3];  [1]
  1. Pennsylvania State Univ., University Park, PA (United States). Dept. of Physics
  2. King Abdullah Univ. of Science and Technology, Thuwal (Saudi Arabia). Physical Sciences and Engineering Division
  3. Univ. of Nebraska, Lincoln, NE (United States). Dept. of Physics and Astronomy. Nebraska Center for Materials and Nanoscience
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division
  5. Seoul National Univ. (Korea, Republic of). Dept. of Physics and Astronomy. IBS-Center for Functional Interfaces of Correlated Electron Systems
  6. Univ. of Science and Technology of China, Hefei (China). Dept. of Physics. Hefei National Lab. for Physical Sciences at Microscale
  7. 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
Citation Metrics:
Cited by: 25 works
Citation information provided by
Web of Science

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Cited By (5)

The Influence of the Ferroelectric and Magnetic Configuration on the Tunnel Current in Double Planar Tunnel Junctions with Ferromagnetic Electrodes and Ferroelectric Barriers journal September 2019
Bi-ferroic memristive properties of multiferroic tunnel junctions journal March 2018
Atomic-scale mapping of interface reconstructions in multiferroic heterostructures journal December 2018
Nonequilibrium Green’s Function and First-Principles Approach to Modeling of Multiferroic Tunnel Junctions journal July 2019
Multiferroic magnetoelectric nanostructures for novel device applications journal September 2015

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