XXV International Symposium Nanophysics and Nanoelectronics, Nizhny Novgorod, March 9-12, 2021
Magnetism

Optimization of the parameters of a ferromagnet/tunnel barrier/noncollinear ferromagnet system for the generation of electromagnetic radiation

E. A. Karashtin<sup>ab

a</sup> Institute for Physics of Microstructures, Russian Academy of Sciences, Nizhny Novgorod, Russia
^b National Research Lobachevsky State University of Nizhny Novgorod, Nizhny Novgorod, Russia

Abstract: The possibility of generating electromagnetic radiation during the transition of conduction electrons between the spin subbands of a noncollinear ferromagnet in the ferromagnet /tunnel barrier/ noncollinear ferromagnet system is investigated. In such a system, a nonequilibrium spin is injected into a noncollinear ferromagnet by an electric current which is spin-polarized due to the first homogeneous ferromagnet. It is shown that it is possible to achieve a significant decrease in the critical current of wave generation in the case when both ferromagnets are “bad” metals or semiconductors in comparison with the case when ferromagnets are “good” metals. The estimates obtained for the critical current are experimentally realizable. It is possible to control the frequency of the electromagnetic wave emitted by the system by manipulating the voltage applied to it.

Keywords: noncollinear ferromagnet, exchange interaction, spin–orbital interaction, tunneling magnetic contact.

Received: 09.04.2021
Revised: 09.04.2021
Accepted: 19.04.2021

DOI: 10.21883/FTT.2021.09.51254.16H

 English version: Physics of the Solid State, 2021, 63:9, 1397–1402

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