Efficiency of spin-injection terahertz oscillator
Yu. V. Gulyaev, S. G. Chigarev, I. V. Malikov, G. M. Mikhailov, P. E., Zilberman, E. M. Epshtein
TL;DR
This paper experimentally evaluates the energy efficiency of a spin-injection terahertz oscillator, demonstrating that material choice and magnetic flux concentrators significantly impact efficiency and revealing quantum efficiencies exceeding unity due to stimulated radiative transitions.
Contribution
It provides the first experimental analysis of energy efficiency in a spin-injection terahertz oscillator, highlighting the effects of material selection and magnetic flux concentrators.
Findings
Quantum efficiency can exceed unity.
Material choice significantly affects efficiency.
Stimulated radiative transitions contribute substantially.
Abstract
Energy efficiency in terahertz range is evaluated experimentally of a spin-injection oscillator based on a ferromagnetic rod-film structure with point contact between the components. Choice of the film material influences substantially the efficiency. A magnetic flux concentrator is used to improve the efficiency. It is found from the measurements that the quantum efficiency can exceed unity. The latter indicates substantial contribution of stimulated radiative transitions.
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Taxonomy
TopicsQuantum and electron transport phenomena · Terahertz technology and applications · Strong Light-Matter Interactions