Electron spin resonance at extra-high frequencies and low temperatures. Technique and research

The technique and installation for Electron Spin Resonance (ESR) experiments at extra high frequencies f = 5–120 GHz, static magnetic fields up to H = 7 T and very low temperatures (up to T = 0.3 K) are presented. Analysis of experimental ESR/FMR research of some kind of magnetic structures (namely – Co-nanoelements, structured ferrites [1], manganite-perovskite structures [2], etc.) will be given. Besides, physical phenomena, which take place in magnets, possessing well-controlled ESR-features are under discussion. Namely, Sr-doped manganite-perovskites (La_x-Sr_1-xMnO₃) with double exchange interaction will be analyzed as left-handed metamaterials.

References
[1] Vakula A. S, Belous A. G., Kalmykova T. V., Petrushenko S. I., Sukhov V. N., Tarapov S. I., Telecommunications and Radio Engineering 77 (2018), 257-262.
[2] Kalmykova T., Vakula A., Nedukh S., Tarapov S., Belous A., Krivoruchko V., Suhov R., Functional Materials 25 (2018), 241-245.