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Spin-Wave Instabilities in Spin-Transfer-Driven Magnetization Dynamics

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5 Author(s)
Bertotti, G. ; Ist. Naz. di Ricerca Metrologica (INRiM), Turin, Italy ; Bonin, R. ; d'Aquino, M. ; Serpico, C.
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We study the stability of magnetization precessions induced in spin-transfer devices by the injection of spin-polarized electric currents. Instability conditions are derived by introducing a generalized, far-from-equilibrium interpretation of spin waves. It is shown that instabilities are generated by distinct groups of magnetostatically coupled spin waves. Stability diagrams are constructed as a function of external magnetic field and injected spin-polarized current. These diagrams show that the application of larger fields and currents has a stabilizing effect on magnetization precessions. Analytical results are compared with numerical simulations of spin-transfer-driven magnetization dynamics.

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Magnetics Letters, IEEE  (Volume:1 )