High frequency spin torque oscillators with composite free layer spin valve

We report the oscillations of magnetic spin components in a composite free layer spin valve. The associated Landau–Lifshitz–Gilbert–Slonczewski (LLGS) equation is studied by stereographically projecting the spin on to a complex plane and the spin components were found. A fourth order Runge–Kutta num...

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Veröffentlicht in:Journal of magnetism and magnetic materials 2016-07, Vol.410, p.210-217
Hauptverfasser: Natarajan, Kanimozhi, Arumugam, Brinda, Rajamani, Amuda
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Arumugam, Brinda
Rajamani, Amuda
description We report the oscillations of magnetic spin components in a composite free layer spin valve. The associated Landau–Lifshitz–Gilbert–Slonczewski (LLGS) equation is studied by stereographically projecting the spin on to a complex plane and the spin components were found. A fourth order Runge–Kutta numerical integration on LLGS equation also confirms the similar trajectories of the spin components. This study establishes the possibility of a Spin Torque Oscillator in a composite free layer spin valve, where the exchange coupling is ferromagnetic in nature. In-plane and out-of-plane precessional modes of magnetization oscillations were found in zero applied magnetic field and the frequencies of the oscillations were calculated from Fast Fourier Transform of the components of magnetization. Behavior of Power Spectral Density for a range of current density is studied. Finally our analysis shows the occurrence of highest frequency 150GHz, which is in the second harmonics for the specific choice of system parameters.
doi_str_mv 10.1016/j.jmmm.2016.03.032
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subjects Current density
Magnetization
Mathematical analysis
Oscillations
Oscillators
Power Spectral Density
Runge-Kutta method
Spin Torque Oscillator
Spin Transfer Torque
Spin valves
Stereographic projection
Torque
title High frequency spin torque oscillators with composite free layer spin valve
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