Magnetic phase transitions in Ta/CoFeB/MgO multilayers

I. Barsukov; Yu Fu; C. Safranski; Y. -J. Chen; B. Youngblood; A. M. Gonçalves; M. Spasova; M. Farle; J. A. Katine; C. C. Kuo; I. N. Krivorotov

doi:10.1063/1.4921306

Magnetic phase transitions in Ta/CoFeB/MgO multilayers

Materials Science 2015-05-19 v1 Mesoscale and Nanoscale Physics

Authors: I. Barsukov , Yu Fu , C. Safranski , Y. -J. Chen , B. Youngblood , A. M. Gonçalves , M. Spasova , M. Farle , J. A. Katine , C. C. Kuo , I. N. Krivorotov

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Abstract

We study thin films and magnetic tunnel junction nanopillars based on Ta/Co $_{20}$ Fe $_{60}$ B $_{20}$ /MgO multilayers by electrical transport and magnetometry measurements. These measurements suggest that an ultrathin magnetic oxide layer forms at the Co $_{20}$ Fe $_{60}$ B $_{20}$ /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.

Keywords

thin film magnetism thin films magnetic structure

Cite

@article{arxiv.1504.06716,
  title  = {Magnetic phase transitions in Ta/CoFeB/MgO multilayers},
  author = {I. Barsukov and Yu Fu and C. Safranski and Y. -J. Chen and B. Youngblood and A. M. Gonçalves and M. Spasova and M. Farle and J. A. Katine and C. C. Kuo and I. N. Krivorotov},
  journal= {arXiv preprint arXiv:1504.06716},
  year   = {2015}
}

Magnetic phase transitions in Ta/CoFeB/MgO multilayers

Abstract

Keywords

Cite

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