Investigations of the transmission and reflection spectra of THz radiation of magnetic metallic nanowires

Proceedings of SPIE - The International Society for Optical Engineering. 2022. No. 12157. P. 1–9.

Fomin L. A., Krishtop V. G., Zhukova E. S., Zhukov S. S., D.L. Zagorsky, I.M. Doludenko, Chigarev S. G., Vilkov E. A., Panas A. I.

The transmission and reflection spectra of arrays of heterogeneous nanowires made of Ni/Co, FeNi/Co, and Ni/Fe, 
formed in track polymer membranes by the galvanic method, have been studied in the frequency range from 16 to 250 
THz. Many peaks in the 16 - 20 THz range were found in the transmission spectra, while they are not observed in the 
spectrum of a track membrane without nanowires. The absorption spectra of an array of nanowires in a track membrane 
and a membrane without wires are calculated from the obtained spectra. It was found that the fraction of the THz 
radiation power absorbed by nanowires and its spectrum depend on the materials of the nanowires. The features of the 
observed spectra can be explained by two mechanisms. The first is the inverse laser effect in magnetic nanocontacts. And 
the second is the change in electrical resistance due to spin- flip transitions between the spin subbands in the case of a 
non- coplanar distribution of the magnetization of the magnetic layers. This class of quasi- one- dimensional structures 
looks promising for creating THz radiation detectors in a wide spectral range and at room temperature.

Keywords: матричный синтез, nanowires, matrix synthesis, THz radiation, ТГц излучение, гетероструктурные нанопроволоки