Abstract
Adaptive electronics, which are often referred to as memristive systems as they often rely on a memristor (memory resistor), are an emerging technology inspired by adaptive biological systems. Dissipative systems may provide a proper platform to implement an adaptive system due to its inherent adaptive property that parameters describing the system are optimized to maximize the entropy production for a given environment. Here, we report that a non-volatile and reversible adaptive microwave impedance memory device can be realized through the adaptive property of the dissipative structure of the driven ferromagnetic system. Like the memristive device, the microwave impedance of the device is modulated as a function of excitation microwave passing through the device. This kind of new device may not only helpful to implement adaptive information processing technologies, but also may be useful to investigate and understand the underlying mechanism of spontaneous formation of complex and ordered structures.
Highlights
Adaptive electronics, which are often referred to as memristive systems as they often rely on a memristor, are an emerging technology inspired by adaptive biological systems
The present device operates based on the natural ferromagnetic resonance (N-FMR; called the zero-field resonance) effect[14,15,16], and the N-FMR frequency is tuned by modifying the magnetic domain (MD) structure of the yttrium iron garnet (YIG) through an intense microwave signal, where the YIG material has a particular importance due to its outstanding properties such as a high quality factor (Q-factor) with a narrow FMR line-width and extremely low loss[17]
When a microwave signal is applied to the device, the magnetic moments of MDs start to precess around the axis of their magnetic moments (Fig. 1d), where the precession amplitude depends on the frequency and power of the applied microwave signal and the N-FMR frequency of the MDs
Summary
Adaptive electronics, which are often referred to as memristive systems as they often rely on a memristor (memory resistor), are an emerging technology inspired by adaptive biological systems. Dissipative systems that are driven far from equilibrium adapt to changes of the thermodynamic environment by modifying their internal structure to maximize the system’s entropy production according to the maximum entropy production principle[1] (MEPP) Such systems often yield a counterintuitive result that a complex and highly ordered structure, which is called the dissipative structure, appears spontaneously from a disordered and strongly fluctuating state. Unlike the conventional memristive devices that are controlled by a static (or a slowly varying) electromagnetic field, the microwave response of the present device is controlled by the frequency, amplitude and incident direction of the applied microwave signal This full-wave operation is resulted from the adaptive tuning of the magnetic domain (MD) structure of the ferromagnetic material for the driving microwave signal to maximize the energy dissipation of the system
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