Regensburg 2013 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 50: Poster II

MA 50.57: Poster

Freitag, 15. März 2013, 10:30–13:30, Poster D

Synchronization between two pointcontact spin torque nano-oscillators — •Thomas Kendziorczyk and Tilmann Kuhn — Institut für Festkörpertheorie, Westfälische Wilhelms-Universität Münster, Wilhelm-Klemm-Str. 10, 48149 Münster

It has been predicted theoretically and observed experimentally that a direct current traversing a magnetic multilayer exerts a spin torque on the magnetic system which can compensate the natural damping and lead to self-sustaining magnetic oscillations in the GHz range. Due to the easy frequency tunability of the spin torque nano-oscillators (STNOs) this effect has great potential for the construction of nanosized microwave generators. The main problem which has to be solved for future applications is the low output power of a single STNO. Some experiments have already been performed which show that it is possible to synchronize two STNOs. The output power for N synchronized STNOs could in principle scale with N^2. However, in order to construct larger arrays of STNOs a good knowledge about the interaction mechanism between them is indispensable. We will show by means of micromagnetic simulations, that there can exist several different synchronized states for two STNOs depending on the inter-contact distance and the initial phase difference of the free running oscillators. The multistability can be explained by the dispersion of the involved spin waves, which provide the main mechanism for the synchronization.