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

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

doi:10.1063/1.3005644

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

Materials Science 2009-11-13 v1

Authors: J. F. Sierra , V. V. Pryadun , F. G. Aliev , S. E. Russek , M. Garcia-Hernandez , E. Snoeck , V. Metlushko

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Abstract

Ferromagnetic resonance and static magnetic properties of CoFe/Al2O3/CoFe/Py and CoFe/Al2O3/CoFeB/Py magnetic tunnel junctions and of 25nm thick single-layer Permalloy(Py) films have been studied as a function of temperature down to 2K. The temperature dependence of the ferromagnetic resonance excited in the Py layers in magnetic tunnel junctions shows knee-like enhancement of the resonance frequency accompanied by an anomaly in the magnetization near 60K. 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 Al2O3 barrier.

Keywords

magnetic tunnel junctions Permalloy ferromagnetic resonance temperature dependence interface stress magnetic reorientation transition dipolar coupling

Cite

@article{arxiv.0812.4953,
  title  = {Temperature dependent dynamic and static magnetic response in magnetic tunnel junctions with Permalloy layers},
  author = {J. F. Sierra and V. V. Pryadun and F. G. Aliev and S. E. Russek and M. Garcia-Hernandez and E. Snoeck and V. Metlushko},
  journal= {arXiv preprint arXiv:0812.4953},
  year   = {2009}
}

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

Abstract

Keywords

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