Energy-efficient spin-transfer torque magnetization reversal in sub-10-nm magnetic tunneling junction point contacts

Jeongmin Hong, Ping Liang, Vladimir L. Safonov, Sakhrat Khizroev

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

Spin-transfer torque (STT) magnetization reversal in a magnetic tunneling junction (MTJ), Ta/CoFeB/MgO/CoFeB/Ta, built on the tip of a nanoprobe in a direct contact with a copper substrate is demonstrated in the previously unexplored sub-10-nm diameter range. With the contact resistance of the order of 185 kOhm, the measured magnetoresistance value was 29 %. The average STT reversal current of 95 nA indicated a switching current density of approximately 0.1 MAcm-2 which is more than 30 times smaller than the smallest value reported for STT-MTJs of larger dimensions. An atomistic-scale theory confirmed the experimental result which indicates at least an order of magnitude reduction of the spin damping in the sub-10-nm diameter range.

Original languageEnglish (US)
Article number1599
JournalJournal of Nanoparticle Research
Volume15
Issue number4
DOIs
StatePublished - Apr 2013

Keywords

  • Energy-efficient electronics
  • Reduced spin damping
  • Spin-transfer torque devices

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Atomic and Molecular Physics, and Optics
  • Modeling and Simulation
  • Materials Science(all)
  • Condensed Matter Physics

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