Abstract
We have studied the magnetic and electrical properties of double CoFeB-MgO interface magnetic tunnel junctions (MTJs) with various W insertion layer thicknesses tW annealed at 400 °C and evaluated tW dependence of thermal stability factor Δ, intrinsic critical current IC0 and damping constant α. It was found that spin-transfer torque efficiency (ΔIC0) values increased with decreasing tW as compared with the same MTJ size D. α measured by ferromagnetic resonance increased with an increase in tW, which is consistent with those calculated from ΔIC0. This result indicates that lower damping constant of MTJ with thin W insertion layer contributes to higher ΔIC0.
Original language | English |
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Article number | 8674769 |
Journal | IEEE Transactions on Magnetics |
Volume | 55 |
Issue number | 7 |
DOIs | |
Publication status | Published - 2019 Jul |
Keywords
- CoFeB-MgO
- W insertion layer
- damping constant
- double interfaces structure
- interfacial anisotropy
- magnetic tunnel junction (MTJ)
- spin-transfer torque magnetic random access memory (STT-MRAM)
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Electrical and Electronic Engineering