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Title: Magnetic phase transitions in Ta/CoFeB/MgO multilayers

Abstract

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

Authors:
; ; ; ;  [1];  [2];  [1];  [3]; ;  [4];  [5];  [6]
  1. Physics and Astronomy, University of California, Irvine, California 92697 (United States)
  2. INAC/CEA, Grenoble, 17 Avenue des Martyrs, 38054 Grenoble (France)
  3. (Brazil)
  4. Fakultät für Physik and Center for Nanointegration (CeNIDE), Universität Duisburg-Essen, 47048 Duisburg (Germany)
  5. HGST Research Center, San Jose, California 95135 (United States)
  6. Components Research, Intel, Hillsboro, Oregon 97124 (United States)
Publication Date:
OSTI Identifier:
22399046
Resource Type:
Journal Article
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 106; Journal Issue: 19; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0003-6951
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ANTIFERROMAGNETISM; APPROXIMATIONS; CARBON DIOXIDE; COBALT COMPOUNDS; FERROMAGNETISM; INTERFACES; IRON BORIDES; LAYERS; MAGNESIUM OXIDES; MAGNETIC PROPERTIES; PHASE TRANSFORMATIONS; SPIN; SUPERCONDUCTING JUNCTIONS; TANTALUM; THIN FILMS; TORQUE; TUNNEL EFFECT

Citation Formats

Barsukov, I., Safranski, C., Chen, Y.-J., Youngblood, B., Krivorotov, I. N., Fu, Yu, Gonçalves, A. M., Centro Brasileiro de Pesquisas Físicas, Rua Dr. Xavier Sigaud, 150, Rio de Janeiro 22.290-180, RJ, Spasova, M., Farle, M., Katine, J. A., and Kuo, C. C. Magnetic phase transitions in Ta/CoFeB/MgO multilayers. United States: N. p., 2015. Web. doi:10.1063/1.4921306.
Barsukov, I., Safranski, C., Chen, Y.-J., Youngblood, B., Krivorotov, I. N., Fu, Yu, Gonçalves, A. M., Centro Brasileiro de Pesquisas Físicas, Rua Dr. Xavier Sigaud, 150, Rio de Janeiro 22.290-180, RJ, Spasova, M., Farle, M., Katine, J. A., & Kuo, C. C. Magnetic phase transitions in Ta/CoFeB/MgO multilayers. United States. doi:10.1063/1.4921306.
Barsukov, I., Safranski, C., Chen, Y.-J., Youngblood, B., Krivorotov, I. N., Fu, Yu, Gonçalves, A. M., Centro Brasileiro de Pesquisas Físicas, Rua Dr. Xavier Sigaud, 150, Rio de Janeiro 22.290-180, RJ, Spasova, M., Farle, M., Katine, J. A., and Kuo, C. C. Mon . "Magnetic phase transitions in Ta/CoFeB/MgO multilayers". United States. doi:10.1063/1.4921306.
@article{osti_22399046,
title = {Magnetic phase transitions in Ta/CoFeB/MgO multilayers},
author = {Barsukov, I. and Safranski, C. and Chen, Y.-J. and Youngblood, B. and Krivorotov, I. N. and Fu, Yu and Gonçalves, A. M. and Centro Brasileiro de Pesquisas Físicas, Rua Dr. Xavier Sigaud, 150, Rio de Janeiro 22.290-180, RJ and Spasova, M. and Farle, M. and Katine, J. A. and Kuo, C. C.},
abstractNote = {We study thin films and magnetic tunnel junction nanopillars based on Ta/Co{sub 20}Fe{sub 60}B{sub 20}/MgO multilayers by electrical transport and magnetometry measurements. These measurements suggest that an ultrathin magnetic oxide layer forms at the Co{sub 20}Fe{sub 60}B{sub 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.},
doi = {10.1063/1.4921306},
journal = {Applied Physics Letters},
issn = {0003-6951},
number = 19,
volume = 106,
place = {United States},
year = {2015},
month = {5}
}