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Title: Giant interfacial perpendicular magnetic anisotropy in MgO/CoFe/capping layer structures

Abstract

Magnetic tunnel junction based on the CoFeB/MgO/CoFeB structures is of great interest due to its application in the spin-transfer-torque magnetic random access memory (STT-MRAM). Large interfacial perpendicular magnetic anisotropy (PMA) is required to achieve high thermal stability. Here, we use the first-principles calculations to investigate the magnetic anisotropy energy (MAE) of the MgO/CoFe/capping layer structures, where the capping materials include 5d metals Hf, Ta, Re, Os, Ir, Pt, and Au and 6p metals Tl, Pb, and Bi. We demonstrate that it is feasible to enhance PMA by using proper capping materials. Relatively large PMA is found in the structures with the capping materials of Hf, Ta, Os, Ir, and Pb. More importantly, the MgO/CoFe/Bi structure gives rise to giant PMA (6.09 mJ/m 2), which is about three times larger than that of the MgO/CoFe/Ta structure. The origin of the MAE is elucidated by examining the contributions to MAE from each atomic layer and orbital. Lastly, these findings provide a comprehensive understanding of the PMA and point towards the possibility to achieve the advanced-node STT-MRAM with high thermal stability.

Authors:
 [1];  [2]; ORCiD logo [2];  [2];  [2];  [3];  [2];  [2]; ORCiD logo [4];  [5];  [4]
  1. Beihang Univ., Beijing (China); Univ. of California, Los Angeles, CA (United States)
  2. Beihang Univ., Beijing (China)
  3. Univ. Paris-Saclay, Palaiseau (France); Univ. Grenoble Alps, Grenoble (France); CEA, INAC-SPINTEC, Grenoble (France)
  4. Univ. of California, Los Angeles, CA (United States)
  5. Univ. of California, Los Angeles, CA (United States); Inston Inc., Los Angeles, CA (United States)
Publication Date:
Research Org.:
Univ. of California at Riverside, Riverside, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1466002
Grant/Contract Number:  
SC0012670
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 110; Journal Issue: 7; Journal ID: ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Peng, Shouzhong, Zhao, Weisheng, Qiao, Junfeng, Su, Li, Zhou, Jiaqi, Yang, Hongxin, Zhang, Qianfan, Zhang, Youguang, Grezes, Cecile, Amiri, Pedram Khalili, and Wang, Kang L. Giant interfacial perpendicular magnetic anisotropy in MgO/CoFe/capping layer structures. United States: N. p., 2017. Web. doi:10.1063/1.4976517.
Peng, Shouzhong, Zhao, Weisheng, Qiao, Junfeng, Su, Li, Zhou, Jiaqi, Yang, Hongxin, Zhang, Qianfan, Zhang, Youguang, Grezes, Cecile, Amiri, Pedram Khalili, & Wang, Kang L. Giant interfacial perpendicular magnetic anisotropy in MgO/CoFe/capping layer structures. United States. doi:10.1063/1.4976517.
Peng, Shouzhong, Zhao, Weisheng, Qiao, Junfeng, Su, Li, Zhou, Jiaqi, Yang, Hongxin, Zhang, Qianfan, Zhang, Youguang, Grezes, Cecile, Amiri, Pedram Khalili, and Wang, Kang L. Mon . "Giant interfacial perpendicular magnetic anisotropy in MgO/CoFe/capping layer structures". United States. doi:10.1063/1.4976517. https://www.osti.gov/servlets/purl/1466002.
@article{osti_1466002,
title = {Giant interfacial perpendicular magnetic anisotropy in MgO/CoFe/capping layer structures},
author = {Peng, Shouzhong and Zhao, Weisheng and Qiao, Junfeng and Su, Li and Zhou, Jiaqi and Yang, Hongxin and Zhang, Qianfan and Zhang, Youguang and Grezes, Cecile and Amiri, Pedram Khalili and Wang, Kang L.},
abstractNote = {Magnetic tunnel junction based on the CoFeB/MgO/CoFeB structures is of great interest due to its application in the spin-transfer-torque magnetic random access memory (STT-MRAM). Large interfacial perpendicular magnetic anisotropy (PMA) is required to achieve high thermal stability. Here, we use the first-principles calculations to investigate the magnetic anisotropy energy (MAE) of the MgO/CoFe/capping layer structures, where the capping materials include 5d metals Hf, Ta, Re, Os, Ir, Pt, and Au and 6p metals Tl, Pb, and Bi. We demonstrate that it is feasible to enhance PMA by using proper capping materials. Relatively large PMA is found in the structures with the capping materials of Hf, Ta, Os, Ir, and Pb. More importantly, the MgO/CoFe/Bi structure gives rise to giant PMA (6.09 mJ/m2), which is about three times larger than that of the MgO/CoFe/Ta structure. The origin of the MAE is elucidated by examining the contributions to MAE from each atomic layer and orbital. Lastly, these findings provide a comprehensive understanding of the PMA and point towards the possibility to achieve the advanced-node STT-MRAM with high thermal stability.},
doi = {10.1063/1.4976517},
journal = {Applied Physics Letters},
number = 7,
volume = 110,
place = {United States},
year = {Mon Feb 13 00:00:00 EST 2017},
month = {Mon Feb 13 00:00:00 EST 2017}
}

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Works referenced in this record:

Projector augmented-wave method
journal, December 1994


Efficiency of ab-initio total energy calculations for metals and semiconductors using a plane-wave basis set
journal, July 1996


Efficient iterative schemes for ab initio total-energy calculations using a plane-wave basis set
journal, October 1996


From ultrasoft pseudopotentials to the projector augmented-wave method
journal, January 1999