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VR project Fundamental Fluctuations in Spintronics 2018-2021

Just published in Phys. Rev. B, June 21, 2021

Spintronics is a fascinating technology with potential applications in many fields. In particular spintronics has found a use in More-than-Moore applications, where additional functionality is added to state-of-the-art CMOS. One such application is in non-volatile memories, MRAM cells. My research in the spintronics area addresses microwave Spin Torque Oscillators (STO). Our topic here is fundamental fluctuations in microwave spintronic devices. These fluctuations will be investigated in terms of e.g. frequency stability, oscillator linewidth, and mode jumping. A crucial part of the project is improved STO reliability and fidelity of the simulation models that are used to predict and analyze the experimentally observed characteristics.Our method is founded on in-house experimental sample fabrication, The microwave properties of these devices are characterized, both for individual devices and over larger populations to obtain sufficient statistics. The physical structure of these samples is analyzed by various complementary methods that analysis data is fed into GPU accelerated micro-magnetic simulations in an eScience approach. In that design-of-experiment we input individual randomized devices, with realistic properties to the simulator, and look at the variability in the output.A succesful outcome of the project will enable the community to understand and suppress fundamental fluctuations in spintronic devices and provide a rigorous and powerful eScience tool.