Journal Article

PreJuSER-58000

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Magnetization dynamics induced by ultrashort optical pulses in Fe/Cr thin films

Rzhevsky, A. A.FZJ* ; Krichevtsov, B. B. ; Bürgler, D. E.FZJ* ; Schneider, C. M.FZJ*

2007
APS College Park, Md.

This record in other databases:    

Please use a persistent id in citations: http://hdl.handle.net/2128/7721  doi:10.1103/PhysRevB.75.224434

Abstract: The magnetization dynamics of single-crystalline Fe(001) thin films with Cr cap layers has been studied by an all-optical time-resolved pump-probe technique. The system is characterized by a fourfold in-plane magnetic anisotropy. We observed long-lived (similar to 1 ns) magnetization oscillations caused by the ultrafast (similar to 0.15 ps) optical pulse excitation. The oscillations are associated with the temporal variation of the magnetization component M-z normal to the film surface. The phase of the oscillations is independent of the polarization state of the pump beam giving evidence for a predominantly thermal origin of the excitation. The amplitude of the oscillations considerably depends on the in-plane orientation and magnitude of the magnetic field. The azimuthal variation of the oscillation frequency at constant magnetic field follows the fourfold in-plane magnetic anisotropy. Angle and field variations of the frequency are well described by a uniform precession mode known from the theory of ferromagnetic resonance. Our analysis indicates that the precession amplitude is determined by the frequency of the uniform mode and an in-plane tilting of the effective magnetic field directly caused by the pumping light beam.

Keyword(s): J

Note: Record converted from VDB: 12.11.2012

---

Contributing Institute(s):

1. Elektronische Eigenschaften (IFF-9)
2. Center of Nanoelectronic Systems for Information Technology (CNI)
3. Jülich-Aachen Research Alliance - Fundamentals of Future Information Technology (JARA-FIT)

Research Program(s):

1. Grundlagen für zukünftige Informationstechnologien (P42)

Appears in the scientific report 2007

---

Database coverage:
;

---