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Temperature dependent dynamic and static magnetic response in magnetic tunnel junctions with Permalloy layers

Applied Physics Letters, ISSN: 0003-6951, Vol: 93, Issue: 17
2008
  • 14
    Citations
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  • 29
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Metrics Details

  • Citations
    14
    • Citation Indexes
      14
  • Captures
    29

Article Description

Ferromagnetic resonance and static magnetic properties of CoFe/Al O/CoFePy and CoFe/AlO/CoFeBPy magnetic tunnel junctions and of 25 nm thick single-layer Permalloy (Py) films have been studied as a function of temperature down to 2 K. The temperature dependence of the ferromagnetic resonance excited in the Py layers in magnetic tunnel junctions shows "kneelike" enhancement of the resonance frequency accompanied by an anomaly in the magnetization near 60 K. We attribute the anomalous static and dynamic magnetic response at low temperatures to interface stress induced magnetic reorientation transition at the Py interface which could be influenced by dipolar soft-hard layer coupling through the AlO barrier. © 2008 American Institute of Physics.

Bibliographic Details

J. F. Sierra; V. V. Pryadun; F. G. Aliev; S. E. Russek; M. García-Hernández; E. Snoeck; V. V. Metlushko

AIP Publishing

Physics and Astronomy

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