Journal
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Volume 432, Issue -, Pages 356-361Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jmmm.2017.02.011
Keywords
Spin transfer torque switching; Spin torque oscillation; Nanostructure; Micromagnetic simulation; STNO power
Funding
- National Science Foundation [ECCS-1344218]
- C-SPIN center
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DC current induced magnetization reversal and magnetization oscillation was observed in 500 nm large size Co90Fe10/Cu/Ni80Fe20 pillars. A perpendicular external field enhanced the coercive field separation between the reference layer (Co90Fe10) and free layer (Ni80Fe20) in the pseudo spin valve, allowing a large window of external magnetic field for exploring the free-layer reversal. A magnetic hybrid structure was achieved for the study of spin torque oscillation by applying a perpendicular field >3 kOe. The magnetization precession was manifested in terms of the multiple peaks on the differential resistance curves. Depending on the bias current and applied field, the regions of magnetic switching and magnetization precession on a dynamical stability diagram has been discussed in details. Micromagnetic simulations are shown to be in good agreement with experimental results and provide insight for synchronization of inhomogeneities in large sized device. The ability to manipulate spin-dynamics on large size devices could be proved useful for increasing the output power of the spin-transfer nano-oscillators (STNOs). (C) 2017 Elsevier B.V. All rights reserved.
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