Temperature dependence of the voltage-controlled perpendicular anisotropy in nanoscale MgO|CoFeB|Ta magnetic tunnel junctions

Juan G. Alzate, Pedram Khalili Amiri, Guoqiang Yu, Pramey Upadhyaya, Jordan A. Katine, Juergen Langer, Berthold Ocker, Ilya N. Krivorotov, Kang L. Wang

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83 Scopus citations

Abstract

In this work, we experimentally study the temperature dependence of the perpendicular magnetic anisotropy (PMA) and of the voltage-controlled magnetic anisotropy (VCMA) in nanoscale MgO|CoFeB|Ta-based magnetic tunnel junctions. We demonstrate that the temperature dependences of both the PMA and the VCMA coefficient follow power laws of the saturation magnetization, but with different exponents. We also find that the linear dependence of the PMA on electric field is maintained over a wide temperature range, although the VCMA strength decreases faster as a function of temperature as compared to the PMA. Possible mechanisms leading to the different exponents are discussed.

Original languageEnglish (US)
Article number112410
JournalApplied Physics Letters
Volume104
Issue number11
DOIs
StatePublished - Mar 17 2014

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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