Hohlfeld, Julius

Ultrafast Electron-, Lattice- and Spin-Dynamics in Metals Investigated by Linear and Nonlinear Optical Techniques

Reihe: Akademische Abhandlung zur Physik
ISBN: 978-3-89700-054-5
1998
Preis: 34,90 €
200 Seiten

Abstract

The relaxation of conduction electrons in metals following optical excitations by fs-laser pulses of fundamental interest with regard to both, basic research and technological applications.

The combination of linear and nonlinear optical techniques as well as systematic variations of the sample thickness make this work the most systematic report on this subject. Consequently, several questions which were formerly unresolved are answered in this thesis:

Does the electron phonon interaction depend on the film thickness as expected by k-space arguments? Will the electron-phonon interaction create a non-equilibrium phonon distribution? How large is the penetration depth of deposited energy at the electron-phonon equilibration time? Is the electron dynamics at surfaces/interfaces identical to the one within the bulk? How fast will a magnetization respond to optical excitations by femtosecond laser pulses?

The most important result is related to the last question. It is demonstrated that the magnetization dynamic at the surface of polycrystalline nickel is governed by the electron temperature relaxation once the electron gas is thermalized.

Name      
Adresse   
          
          
Stadt     
Land      
Telefon   
Email     
Bemerkung