Spintronic nanodevices are a prime candidate for the implementation of neuromorphic computing systems. In particular magnetic tunnel junctions (MTJs) are multifunctional nanodevices compatible with CMOS processing are used as magnetic field sensors, non-volatile memories, non-linear oscillators, and rectifiers.
We developed a multifunctional MTJ stack to fabricate various MTJs types in a single process. We present an experimental proof of principle of the weighted spin torque nano-oscillator (WSTNO ) consisting of three MTJ nanopillars. Two non-volatile memories weight the input, which is non-linearly transferred by one oscillator into an output signal. The STNOs have an output power above 1 µW and frequencies of 240 MHz. This WSTNO is a programmable building block for future neuromorphic computing systems.
Other non-volatile effects in the MTJ are explored to enable for example non-volatile tuning of the resonance frequency. In this context, optical access to the nanodevices is a highly relevant and challenging topic which we address.
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