Application Cases

The application of high-voltage amplifiers in the calculation of the physical reservoir pool of ferromagnetic-electrostatic heterojunction systems

Research Direction：

Magnetic-electrical coupling devices with adaptive control, Neuro-inspired computing and reservoir computing, Study on Phase Transition and Physical Properties Controlled by Piezoelectricity,High-frequency/rapid dynamic regulation experiment.

Experimental objective：

The arbitrary waveform generated by the signal generator is amplified by the high-voltage amplifier and then input into the system. The real-time output of the detection system is detected, and the model training and testing for the reserve pool calculation of this system are carried out.

Testing equipment：

Signal generator, ATA-7010 high-voltage amplifier, current source, nanovoltmeter, digital multimeter, etc.

Experimental process：

This experiment first utilized micro-nano processing to fabricate Hall bar devices with magnetic multilayer films on a piezoelectric substrate. Subsequently, through a transfer circuit board, the timing signals were input into the system via a signal generator and a high-voltage amplifier, and the Hall voltage of the device was read as the signal output. Synchronous input and output signals were collected using an instrument, and through model training, the timing signals could be predicted.

The specific experimental platform setup is shown in the following figure. The signals generated by the signal generator were input into the high-voltage amplifier, which produced the required high electric field for the experiment and applied it to the sample. A series of test source meters were used to collect the output signals and the synchronous actual input signals. Using Labview software programming, the measurement results of the instrument were synchronously read on the computer for the subsequent analysis of the experimental data.

Figure1 Schematic diagrams of the experimental method and the skyrmion-enhanced strain-mediated spintronic RC system.

Figure2 Experimental block diagram.

Experimental results：

In the Mackey-Glass chaotic time series prediction task, an arbitrary waveform (≤ ± 4 V) was generated using a signal generator and then amplified by a high-voltage amplifier by a factor of 100 to 200 before being input into the test system. A total of 2500×50×2 = 250,000 data points were continuously collected. After testing, the signal amplification factor and signal accuracy met the experimental requirements. As shown in Figure a, after a long-term test, both the input signal (gray) and the output signal (red) were in a relatively stable state. Figure b shows the data details of the part in the blue box of Figure a.

Figure3 Experimental data.

The effectiveness of the amplifier in this experiment：

1.High-voltage strain drive: The low-voltage timing signal output by the signal generator (WF1948) is linearly amplified to a high voltage of 0–450 V, which is applied to both ends of the PMN-PT piezoelectric substrate (generating a 0–15 kV/cm electric field). Through the inverse piezoelectric effect, controllable in-plane strain is produced, thereby driving changes in the magnetic state and resistivity of the magnetic layer.

2.Physical input support for complex computational tasks: In the Mackey-Glass chaotic time series prediction task, the power amplifier is responsible for loading the preprocessed continuous analog voltage signals in real time onto the device, enabling the reservoir system to receive dynamic electrical input and generate corresponding nonlinear responses, thus ensuring the successful implementation of the prediction task (with an NRMSE of 0.2).

3.Activation of multi-parameter fusion regulation: The electric field provided by the power amplifier not only regulates the density and deformation of skyrmions (magneticization term), but also simultaneously regulates the longitudinal resistivity term, achieving the fusion of "magnetization + resistance" under strain mediation. This is precisely the key reason why the performance of this system is superior to that of a single saturated reservoir.

4.Guarantee of dynamic range and accuracy: Within the working range of 0–5 kV/cm, stable high-precision waveforms are output, ensuring that the slightest changes in the input signal can be effectively responded to by the device. This enables the output signal (in the μV to mV range) to clearly reflect the historical information of the input, thereby verifying the short-term memory effect of the system (with a memory duration of approximately 18 seconds).

Application fields：

Intelligent sensing、New type non-volatile storage、Test of ferroelectric materials、Multiferroicity and Magnetic-Electric Coupling Fundamentals、Materials Physics and Strain Engineering.