Temperature dependence of energy barrier in CoFeB-MgO magnetic tunnel junctions with perpendicular easy axis

Y. Takeuchi; H. Sato; S. Fukami; F. Matsukura; H. Ohno

doi:10.1063/1.4933256

Temperature dependence of energy barrier in CoFeB-MgO magnetic tunnel junctions with perpendicular easy axis

Y. Takeuchi, H. Sato, S. Fukami, F. Matsukura, H. Ohno

Research output: Contribution to journal › Article › peer-review

18 Citations (Scopus)

Abstract

We investigate an energy barrier E that determines the thermal stability factor of nanoscale CoFeB-MgO magnetic tunnel junctions (MTJs) with a perpendicular easy axis as a function of temperature between 298 and 393 K. For the MTJs with a junction diameter above 43 nm, Ε is much smaller and less sensitive to the temperature than the magnetic anisotropy energy of the total recording volume. For the MTJ with a diameter of 33 nm, E and the anisotropy energy take about the same value and show similar temperature dependence. The results can be explained by considering a crossover of magnetization reversal mode from nucleation type to single-domain like type, as the device dimensions reduce.

Original language	English
Article number	152405
Journal	Applied Physics Letters
Volume	107
Issue number	15
DOIs	https://doi.org/10.1063/1.4933256
Publication status	Published - 2015 Oct 12

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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abstract = "We investigate an energy barrier E that determines the thermal stability factor of nanoscale CoFeB-MgO magnetic tunnel junctions (MTJs) with a perpendicular easy axis as a function of temperature between 298 and 393 K. For the MTJs with a junction diameter above 43 nm, Ε is much smaller and less sensitive to the temperature than the magnetic anisotropy energy of the total recording volume. For the MTJ with a diameter of 33 nm, E and the anisotropy energy take about the same value and show similar temperature dependence. The results can be explained by considering a crossover of magnetization reversal mode from nucleation type to single-domain like type, as the device dimensions reduce.",

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T1 - Temperature dependence of energy barrier in CoFeB-MgO magnetic tunnel junctions with perpendicular easy axis

AU - Takeuchi, Y.

AU - Sato, H.

AU - Fukami, S.

AU - Matsukura, F.

AU - Ohno, H.

PY - 2015/10/12

Y1 - 2015/10/12

N2 - We investigate an energy barrier E that determines the thermal stability factor of nanoscale CoFeB-MgO magnetic tunnel junctions (MTJs) with a perpendicular easy axis as a function of temperature between 298 and 393 K. For the MTJs with a junction diameter above 43 nm, Ε is much smaller and less sensitive to the temperature than the magnetic anisotropy energy of the total recording volume. For the MTJ with a diameter of 33 nm, E and the anisotropy energy take about the same value and show similar temperature dependence. The results can be explained by considering a crossover of magnetization reversal mode from nucleation type to single-domain like type, as the device dimensions reduce.

AB - We investigate an energy barrier E that determines the thermal stability factor of nanoscale CoFeB-MgO magnetic tunnel junctions (MTJs) with a perpendicular easy axis as a function of temperature between 298 and 393 K. For the MTJs with a junction diameter above 43 nm, Ε is much smaller and less sensitive to the temperature than the magnetic anisotropy energy of the total recording volume. For the MTJ with a diameter of 33 nm, E and the anisotropy energy take about the same value and show similar temperature dependence. The results can be explained by considering a crossover of magnetization reversal mode from nucleation type to single-domain like type, as the device dimensions reduce.

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Temperature dependence of energy barrier in CoFeB-MgO magnetic tunnel junctions with perpendicular easy axis

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