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Magnetic phase transitions in Ta/CoFeB/MgO multilayers

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arxiv 1504.06716 v1 pith:R2BMSUJW submitted 2015-04-25 cond-mat.mtrl-sci cond-mat.mes-hall

Magnetic phase transitions in Ta/CoFeB/MgO multilayers

I. Barsukov , Yu Fu , C. Safranski , Y.-J. Chen , B. Youngblood , A. M. Gon\c{c}alves , M. Spasova , M. Farle
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J. A. Katine C. C. Kuo I. N. Krivorotov
This is my paper
classification cond-mat.mtrl-sci cond-mat.mes-hall
keywords magneticmultilayersoxidemeasurementsphasetemperaturesantiferromagnetapproximately
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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.

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