Coupling arrays of non-linear nano-oscillators: a theoretical and experimental study

Published : 18 October 2019

Spin momentum transfer allows exploring and studying the non-linear magnetization oscillations in nano-sized magnetic structures and opens potential for novel applications as integrated microwave components. A defining feature of spintronic oscillators is their non-linear dependence of the precession frequency on the amplitude (non-isochronicity) that provides for additional rf functionalities and that modifies the response to external rf signals. While in the past many studies have been performed on single oscillator devices, current efforts concentrate on the coupling of different oscillators to enhance the output signal and to reduce noise. Due to their specific features (non-isochronicity, conservative and dissipative coupling mechanisms, local and/or global coupling) spintronics nano-oscillators are an interesting model system to explore different coupling scenarios such as a fully coherent state, a chimera state, or a chaotic state. All of these states would find quite different applications in either wireless communication, secure communication or neuromorphic computing. Understanding thus the dynamic state of an array, as a function of the geometrical arrangement (1D lines, 2D arrays, ..), the different coupling mechanisms as well as the role of noise, will be an interesting fundamental study with important impact for various applications. This project will undertake a combined simulation and experimental study on the coupling of spintronics oscillators. The internship will start with simulations to guide experiments and during the PhD the student will be involved in the realization of the devices and carry out the dynamic characterization.

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