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Journal Articles Applied Physics Letters Year : 2015

Magnetic phase transitions in Ta/CoFeB/MgO multilayers

I. Barsukov
  • Function : Author
C. Safranski
  • Function : Author
Y. J. Chen
  • Function : Author
B. Youngblood
  • Function : Author
A. M. Goncalves
  • Function : Author
M. Spasova
  • Function : Author
M. Farle
  • Function : Author
C. C. Kuo
  • Function : Author
I. N. Krivorotov
  • Function : Author

Abstract

We study thin films and magnetic tunnel junction nanopillars based on Ta/Co20Fe60B20/MgO multilayers by electrical transport and magnetometry measurements. These measurements suggest that an ultrathin magnetic oxide layer forms at the Co20Fe60B20/MgO interface. At approximately 160 K, the oxide undergoes a phase transition from an insulating antiferromagnet at low temperatures to a conductive weak ferromagnet at high temperatures. This interfacial magnetic oxide is expected to have significant impact on the magnetic properties of CoFeB-based multilayers used in spin torque memories. (C) 2015 AIP Publishing LLC.

Dates and versions

hal-01585687 , version 1 (11-09-2017)

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I. Barsukov, Yu Fu, C. Safranski, Y. J. Chen, B. Youngblood, et al.. Magnetic phase transitions in Ta/CoFeB/MgO multilayers. Applied Physics Letters, 2015, 106 (19), pp.192407. ⟨10.1063/1.4921306⟩. ⟨hal-01585687⟩
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