Magnetic phase transitions in Ta/CoFeB/MgO multilayers

2015/04/25 by I. Barsukov, Yu Fu, C. Safranski +8 · 1 citation
Physics and Astronomy · #cond-mat.mtrl-sci #cond-mat.mes-hall

paper · pdf · doi:10.1063/1.4921306

published as Appl. Phys. Lett. 106, 192407 (2015)

arxiv created 2015/04/25 · arxiv updated 2015/05/19

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.

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