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

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

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

22 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)

Access to Document

10.1063/1.4933256

Cite this

@article{562980ed9af54ba69417eade60d0d3f7,

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

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.",

author = "Y. Takeuchi and Hideo Sato and S. Fukami and F. Matsukura and H. Ohno",

year = "2015",

month = oct,

day = "12",

doi = "10.1063/1.4933256",

language = "English",

volume = "107",

journal = "Applied Physics Letters",

issn = "0003-6951",

publisher = "American Institute of Physics Publising LLC",

number = "15",

}

TY - JOUR

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

AU - Takeuchi, Y.

AU - Sato, Hideo

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.

UR - http://www.scopus.com/inward/record.url?scp=84944398809&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84944398809&partnerID=8YFLogxK

U2 - 10.1063/1.4933256

DO - 10.1063/1.4933256

M3 - Article

AN - SCOPUS:84944398809

VL - 107

JO - Applied Physics Letters

JF - Applied Physics Letters

SN - 0003-6951

IS - 15

M1 - 152405

ER -

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

Abstract

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Cite this