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Chin. Phys. B, 2021, Vol. 30(2): 028506    DOI: 10.1088/1674-1056/abcf9d

RF magnetron sputtering induced the perpendicular magnetic anisotropy modification in Pt/Co based multilayers

Runze Li(李润泽)1,2, Yucai Li(李予才)1,2, Yu Sheng(盛宇)1, and Kaiyou Wang(王开友)1,2,3,4,
1 State Key Laboratory for Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China; 2 Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China; 3 Beijing Academy of Quantum Information Sciences, Beijing 100193, China; 4 Center for Excellence in Topological Quantum Computation, University of Chinese Academy of Sciences, Beijing 100049, China
Abstract  We demonstrate that radio frequency (RF) magnetron sputtering technique can modify the perpendicular magnetic anisotropy (PMA) of Pt/Co/normal metal (NM) thin films. Influence of ion irradiation during RF magnetron sputtering should not be neglected and it can weaken PMA of the deposited magnetic films. The magnitude of this influence can be controlled by tuning RF magnetron sputtering deposition conditions and the upper NM layer thickness. According to the stopping and range of ions in matter (SRIM) simulation results, defects such as displacement atoms and vacancies in the deposited film will increase after the RF magnetron sputtering, which can account for the weakness of PMA. The amplitude changes of the Hall resistance and the threshold current intensity of spin orbit torque (SOT) induced magnetization switching also can be modified. Our study could be useful for controlling magnetic properties of PMA films and designing new type of SOT-based spintronic devices.
Keywords:  perpendicular magnetic anisotropy      RF magnetron sputtering      ion irradiation      spin orbit torque  
Published:  26 January 2021
PACS:  85.70.-w (Magnetic devices)  
  75.70.-i (Magnetic properties of thin films, surfaces, and interfaces)  
  79.20.-m (Impact phenomena (including electron spectra and sputtering))  
Fund: Project supported by the National Key R&D Program of China (Grant No. 2017YFB0405700), the National Natural Science Foundation of China (Grant Nos. 11474272 and 61774144), Beijing Natural Science Foundation Key Program, China (Grant No. Z190007), and the Chinese Academy of Sciences (Grant Nos. QYZDY-SSW-JSC020, XDB44000000, and XDB28000000).
Corresponding Authors:  Corresponding author. E-mail:   

Cite this article: 

Runze Li(李润泽), Yucai Li(李予才), Yu Sheng(盛宇), and Kaiyou Wang(王开友) RF magnetron sputtering induced the perpendicular magnetic anisotropy modification in Pt/Co based multilayers 2021 Chin. Phys. B 30 028506

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