Measuring solar irradiance allows for direct maximization\ud
of the efficiency in photovoltaic power plants. However,\ud
devices for solar irradiance sensing, such as pyranometers and\ud
pyrheliometers, are expensive and difficult to calibrate and thus\ud
seldom utilized in photovoltaic power plants. Indirect methods\ud
are instead implemented in order to maximize efficiency.\ud
This paper proposes a novel approach for solar irradiance\ud
measurement based on neural networks, which may, in turn,\ud
be used to maximize efficiency directly. An initial estimate\ud
suggests the cost of the sensor proposed herein may be price\ud
competitive with other inexpensive solutions available in the\ud
market, making the device a good candidate for large deployment\ud
in photovoltaic power plants. The proposed sensor is implemented\ud
through a photovoltaic cell, a temperature sensor, and a low–\ud
cost microcontroller. The use of a microcontroller allows for\ud
easy calibration, updates, and enhancement by simply adding\ud
code libraries. Furthermore, it can be interfaced via standard\ud
communication means with other control devices; integrated into\ud
control schemes; and remote–controlled through its embedded\ud
web server. The proposed approach is validated through experimental\ud
prototyping and compared against a commercial device
Spin-Hall oscillators (SHO) are promising sources of spin-wave signals for magnonics applications, and can serve as building blocks for magnonic logic in ultralow power computation devices. Thin magnetic layers used as “free” layers in SHO are in contact with heavy metals having large spin-orbital interaction, and, therefore, could be subject to the spin-Hall effect (SHE) and the interfacial Dzyaloshinskii-Moriya interaction (i-DMI), which may lead to the nonreciprocity of the excited spin waves and other unusual effects. Here, we analytically and micromagnetically study magnetization dynamics excited in an SHO with oblique magnetization when the SHE and i-DMI act simultaneously. Our key results are: (i) excitation of nonreciprocal spin-waves propagating perpendicularly to the in-plane projection of the static magnetization; (ii) skyrmions generation by pure spin-current; (iii) excitation of a new spin-wave mode with a spiral spatial profile originating from a gyrotropic rotation of a dynamical skyrmion. These results demonstrate that SHOs can be used as generators of magnetic skyrmions and different types of propagating spin-waves for magnetic data storage and signal processing applications.
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