Journal
APPLIED PHYSICS LETTERS
Volume 107, Issue 15, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4933256
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Funding
- FIRST program of JSPS
- R&D for Next-Generation Information Technology of MEXT
- R&D Subsidiary Program for Promotion of Academia-industry Cooperation of METI
- ImPACT program of CSTI
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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, E 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. (C) 2015 AIP Publishing LLC.
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