Novel laser based on magnetic tunneling

• Veröffentlicht in: Физика низких температур
• Datum: 2005
• Hauptverfasser: Kadigrobov, A., Shekhter, R.I., Jonson, M.
• Format: Artikel
• Sprache: Englisch
• Veröffentlicht: Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України 2005
• Schlagworte: Низкоразмерные и неупорядоченные системы
• Online Zugang: https://nasplib.isofts.kiev.ua/handle/123456789/121766
• Назва журналу: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Zitieren: Novel laser based on magnetic tunneling / A. Kadigrobov, R.I. Shekhter, M. Jonson // Физика низких температур. — 2005. — Т. 31, № 3-4. — С. 463-470. — Бібліогр.: 26 назв. — англ.

A new principle for a compact spin-based solid-state laser is proposed. It operates in the
 1–100 THz regime, which is difficult to reach with small size lasers. Spin-flip processes in ferromagnetic
 conductors form a basis — the mechanism is due to a coupling of light to the exchange interaction
 in magnetically ordered conductors via the dependence of the exchange constant on the
 conduction electron momenta. The interaction strength is proportional to the large exchange energy
 and exceeds the Zeeman interaction by orders of magnitude. A giant lasing effect is predicted
 in a system where a population inversion has been created by injection of spin-polarized electrons
 from one ferromagnetic conductor into another through an intermediate tunnel region or weak
 link; the magnetizations of the two ferromagnets have different orientations. We show that the
 laser frequency will be in the range 1–100 THz if the experimental data for ferromagnetic manganese
 perovskites with nearly 100% spin polarization are used. The optical gain is estimated to be
 gopt ~ 10⁷ cm⁻¹. This exceeds the gain of conventional semiconductor lasers by 3 or 4 orders of
 magnitude. An experimental configuration is proposed in order to solve heating problems at a relatively
 high threshold current density.