Ultrafast Demagnetization After Femtosecond Laser Pulses: Transfer of Angular Momentum from the Electronic System to Magnetoelastic Spin-Phonon Modes

Autor:	Christian Illg, Manfred Fähnle, Boris Müller, Theodoros Tsatsoulis, Lei Zhang, Michael Haag
Rok vydání:	2017
Předmět:	Angular momentum Phonon High Energy Physics::Lattice Physics::Optics Rotational transition 02 engineering and technology 01 natural sciences law.invention symbols.namesake Condensed Matter::Materials Science Optics law Total angular momentum quantum number Condensed Matter::Superconductivity 0103 physical sciences Angular momentum of light Angular momentum coupling Orbital angular momentum of light Spin (physics) 010306 general physics Physics Condensed matter physics business.industry Momentum transfer Laser 021001 nanoscience & nanotechnology Condensed Matter Physics Electronic Optical and Magnetic Materials Femtosecond symbols Orbital angular momentum multiplexing Condensed Matter::Strongly Correlated Electrons Hamiltonian (quantum mechanics) business 0210 nano-technology Excitation
Zdroj:	Journal of Superconductivity and Novel Magnetism. 30:1381-1387
ISSN:	1557-1947 1557-1939
Popis:	When exciting a ferromagnetic film with a femtosecond optical laser pulse, then there is a partial demagnetization within a few hundred fs. This means that the angular momentum of the electronic system is transferred to the lattice. This transfer is calculated by describing the lattice degrees of freedom as spin-phonon eigenmodes which have a sharp angular momentum. Possible other lattice degrees of freedom are mentioned but not considered explicitly. For Ni and Fe the calculated amount of transfer of angular momentum to the spin-phonon eigenmodes is rather small.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4a01359d6c60bb495abda2988d8699ec https://doi.org/10.1007/s10948-016-3950-z Zobrazit plný text záznamu Full text from SpringerLink