Arrays of 10 nm-diameter point contacts of exchange-coupled spin-majority/spin-minority ferromagnetic metals, integrated into infrared-terahertz range photon resonators, are fabricated and measured electrically and optically. Giant, threshold-type electronic excitations under high-current pumping of the devices are observed as abrupt but reversible steps in device resistance, in many cases in access of 100%, which correlate with optical emission from the devices. The results are interpreted as due to stimulated spin-flip electron-photon relaxation in the system.
@article{arxiv.1208.0550,
title = {Stimulated emission of radiation using spin-population inversion in metals: a spin-laser},
author = {V. Korenivski and A. Iovan and A. Kadigrobov and R. I. Shekhter},
journal= {arXiv preprint arXiv:1208.0550},
year = {2013}
}