Journal
APPLIED PHYSICS LETTERS
Volume 107, Issue 23, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4937443
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Funding
- Ministry of Science and Technology of Republic of China [NSC 102-2221-E-007-043-MY2, MOST 104-2221-E-007-047-MY2]
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To address thermal stability issues for spintronic devices with a reduced size, we investigate spin-orbit torque in Co/Pt multilayers with strong perpendicular magnetic anisotropy. Note that the spin-orbit torque arises from the global imbalance of the spin currents from the top and bottom interfaces for each Co layer. By inserting Ta or Cu layers to strengthen the top-down asymmetry, the spin-orbit torque efficiency can be greatly modified without compromised perpendicular magnetic anisotropy. Above all, the efficiency builds up as the number of layers increases, realizing robust thermal stability and high spin-orbit-torque efficiency simultaneously in the multilayers structure. (C) 2015 AIP Publishing LLC.
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