The thermal stability improvement of spin-orbit-torque (SOT) devices with a thin PtMn insertion

Yao Jen Chang*, Fang Ming Chen, Kuan Ming Chen, Shan Yi Yang, Yu Chen Hsin, Sk Ziaur Rahaman, I. Jung Wang, Hsin Han Lee, Yi Hui Su, Guan Long Chen, Cheng Yi Shih, Shih Ching Chiu, Jeng Hua Wei, Shyh Shyuan Sheu, Wei Chung Lo, Yuan Chieh Tseng, Chih Huang Lai, Denny Tang, Chih I. Wu

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

For the 1st time, we propose a novel design of spin-orbit-torque (SOT) magnetic tunnel junction (MTJ) cells in which a thin antiferromagnetic (AFM) material is inserted between the CoFeB-based free layer and SOT channel to improve device thermal stability. This insertion strengthens not only the cell thermal stability for better data retention performance but also the immunity to the external magnetic field disturbance due to coercivity (Hc) enhancement. The SOT cells with a PtMn insertion show the shift of R-H loop by applying a write current in the SOT channel and is reversible. Since the specific write current density (Jbias) affects the AFM exchange bias direction, the PtMn-inserted SOT cells can reduce the unilateral switching current. In this circumstance, the PtMn-inserted SOT cells can optimize the trade-off between switching current density (Jc) and thermal stability (?).

Original languageEnglish
Title of host publication2022 International Symposium on VLSI Technology, Systems and Applications, VLSI-TSA 2022
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781665409230
DOIs
StatePublished - 2022
Event2022 International Symposium on VLSI Technology, Systems and Applications, VLSI-TSA 2022 - Hsinchu, Taiwan
Duration: 18 Apr 202221 Apr 2022

Publication series

Name2022 International Symposium on VLSI Technology, Systems and Applications, VLSI-TSA 2022

Conference

Conference2022 International Symposium on VLSI Technology, Systems and Applications, VLSI-TSA 2022
Country/TerritoryTaiwan
CityHsinchu
Period18/04/2221/04/22

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