CoFeB Thickness Dependence of Thermal Stability Factor in CoFeB/MgO Perpendicular Magnetic Tunnel Junctions

H. Sato; M. Yamanouchi; K. Miura; S. Ikeda; R. Koizumi; F. Matsukura; H. Ohno

doi:10.1109/LMAG.2012.2190722

CoFeB Thickness Dependence of Thermal Stability Factor in CoFeB/MgO Perpendicular Magnetic Tunnel Junctions

Materials Science 2012-08-30 v1

Authors: H. Sato , M. Yamanouchi , K. Miura , S. Ikeda , R. Koizumi , F. Matsukura , H. Ohno

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Abstract

Thermal stability factor (delta) of recording layer was studied in perpendicular anisotropy CoFeB/MgO magnetic tunnel junctions (p-MTJs) with various CoFeB recording layer thicknesses and junction sizes. In all series of p-MTJs with different thicknesses, delta is virtually independent of the junction sizes of 48-81 nm in diameter. The values of delta increase linearly with increasing the recording layer thickness. The slope of the linear fit is explained well by a model based on nucleation type magnetization reversal.

Keywords

perpendicular magnetic tunnel junctions thermal stability factor CoFeB thickness magnetization reversal nucleation model perpendicular anisotropy

Cite

@article{arxiv.1208.5828,
  title  = {CoFeB Thickness Dependence of Thermal Stability Factor in CoFeB/MgO Perpendicular Magnetic Tunnel Junctions},
  author = {H. Sato and M. Yamanouchi and K. Miura and S. Ikeda and R. Koizumi and F. Matsukura and H. Ohno},
  journal= {arXiv preprint arXiv:1208.5828},
  year   = {2012}
}

Comments

12 pages, 5 figures

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