Magnetic phase transitions in Ta/CoFeB/MgO multilayers

Magnetic phase transitions in Ta/CoFeB/MgO multilayers

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 unde...

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Veröffentlicht in:Applied physics letters 2015-05, Vol.106 (19)
Hauptverfasser: Barsukov, I., Fu, Yu, Safranski, C., Chen, Y.-J., Youngblood, B., Gonçalves, A. M., Spasova, M., Farle, M., Katine, J. A., Kuo, C. C., Krivorotov, I. N.
Format: Artikel
Sprache:eng
Schlagworte:
ANTIFERROMAGNETISM
APPROXIMATIONS
CARBON DIOXIDE
COBALT COMPOUNDS
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
FERROMAGNETISM
INTERFACES
IRON BORIDES
LAYERS
MAGNESIUM OXIDES
MAGNETIC PROPERTIES
PHASE TRANSFORMATIONS
Physics
SPIN
SUPERCONDUCTING JUNCTIONS
TANTALUM
THIN FILMS
TORQUE
TUNNEL EFFECT
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Zusammenfassung: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.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4921306