1208.0550 (V. Korenivski et al.)

Giant excitations in near-ballistic majority/minority ferromagnetic
point-contact arrays integrated into photon resonators: toward THz
metal-based spin-flip lasers    [PDF]

V. Korenivski, A. Iovan, A. Kadigrobov, R. I. Shekhter

Arrays of 10 nm-diameter point contacts of exchange-coupled spin-majority/spin-minority ferromagnetic metals, integrated into THz-range photon resonators, are fabricated and measured using transport spectroscopy. Giant, threshold-type conductance 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%. The results are interpreted as due to stimulated spin-flip photon emission, consistent with the expected lasing action in the system.

View original: http://arxiv.org/abs/1208.0550