Journal
PHYSICAL REVIEW B
Volume 99, Issue 18, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.99.184403
Keywords
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Funding
- National Science Foundation (NSF) [1611570]
- Nanosystems Engineering Research Center for Translational Applications of Nanoscale Multiferroic Systems (TANMS)
- Spins and Heat in Nanoscale Electronic Systems (SHINES), an Energy Frontier Research Center - U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES) [DE-SC0012670]
- Function Accelerated nanoMaterial Engineering (FAME) Center
- Center for SpintronicMaterials
- Microelectronics Advanced Research Corporation (MARCO)
- Defense Advanced Research Projects Agency (DARPA)
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The switching of magnetization by current-induced spin-orbit torque (SOT) has potential applications for energy-efficient spintronic devices. In the past, most conventional works have been focused on SOT in heavy metals. Here the SOT from a ferromagnetic metal is investigated, and two mechanisms of the field-free SOT induced magnetization switching are demonstrated to be from the interlayer exchange coupling and the tilted perpendicular magnetic anisotropy. We exclude the spin torque contribution from the anomalous Hall effect and the interfacial Rashba effect combined with spin precession. A spin Hall angle theta(SH) = -0.022 of CoFeB is obtained by the current-induced hysteresis loop shift method, and the obtained theta(SH) is comparable with heavy metals. This work demonstrates that a considerable SOT can come from a ferromagnetic metal, and indicates the unconventional origin of spin-orbit coupling.
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