Coherent terahertz emission from ferromagnetic films excited by femtosecond laser pulses

Autor:	Charles A. Schmuttenmaer, Matthew C. Beard, Eric Beaurepaire, Jean-Yves Bigot, Gordon M. Turner, Shayne M. Harrel
Rok vydání:	2004
Předmět:	Electromagnetic field Physics Physics and Astronomy (miscellaneous) Condensed matter physics Terahertz radiation Physics::Optics Near and far field Laser law.invention Magnetization law Electric field Magnetic dipole Electromagnetic pulse
Zdroj:	Applied Physics Letters. 84:3465-3467
ISSN:	1077-3118 0003-6951
Popis:	It is shown that the laser induced ultrafast demagnetization of ferromagnetic films results in the emission of a terahertz electromagnetic pulse. This emission has been detected from Ni films using free-space electro-optic sampling. The radiated electric field E(t) is explained by Maxwell equations (radiation from a time dependent magnetic dipole), and is expected to be proportional to the second time derivative of the magnetization d2M/dt2, as measured in the far field. This technique opens appealing perspectives in the context of measuring and understanding the ultrafast spin dynamics as well as the interaction of electrons (both charge and spin) with electromagnetic fields.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::b80ae1c51cefc3e005f9d87b331257dd https://doi.org/10.1063/1.1737467 Zobrazit plný text záznamu