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V. S. Pribiag, I. N. Krivorotov, G. D. Fuchs, P. M. Braganca, O. Ozatay, J. C. Sankey, D. C. Ralph, and R. A. Buhrman, “Magnetic Vortex Oscillator Driven by D.C. Spin-Polarized Current,” Nature Physics 3, 498 (2007).