Dresden 2014 – scientific programme

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MA: Fachverband Magnetismus

MA 37: Spin Torque and Spin Excitations I

MA 37.9: Talk

Thursday, April 3, 2014, 11:45–12:00, HSZ 401

Micromagnetic simulation of a spin-torque oscillator driven by pure spin currents — •Henning Ulrichs, Vladislav E. Demidov, and Sergej O. Demokritov — Institut für angewandte Physik, WWU Münster, Corrensstraße 2-4, 48149 Münster

In this talk a micromagnetic simulation of a novel kind of spin torque nano-oscillator compromising a patterned Pt / NiFe double layer is presented. The operational principle of this oscillator relies on the spin-Hall effect in the Pt. In contrast to conventional spin-torque oscillators, the spin-torque is conveyed by pure spin currents, flowing from the Pt into the NiFe. The numerical results support the experimental claim that the dominant auto-oscillation mode is the spin-wave bullet mode. Moreover, a recently experimentally observed secondary mode is also found in the simulation. Spatial features of the bullet mode, which are in experiments obscured due to optical limitations, are investigated. It is shown that the diameter of the spin-wave bullet is about 80 nm. The physical nature of the secondary mode is elucidated.