2007/06/30 by J. Qi, Jian Quan Qi, Y. Xu +6 · 3 citations
Materials Science · Physics and Astronomy · #Electronic and Structural Properties of Oxides #Magnetic properties of thin films #ZnO doping and properties #cond-mat.mtrl-sci
paper · pdf · doi:10.1063/1.2785114
7 pages,3 figures
arxiv created 2007/07/19 · openalex publication_date 2007/09/10 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The authors use femtosecond optical pulses to induce, control, and monitor magnetization precession in ferromagnetic Ga0.965Mn0.035As. At temperatures below ∼40K, they observe coherent oscillations of the local Mn spins, triggered by an ultrafast photoinduced reorientation of the in-plane easy axis. The amplitude saturation of the oscillations above a certain pump intensity indicates that the easy axis remains unchanged above ∼TC∕2. The authors find that the observed magnetization precession damping (Gilbert damping) is strongly dependent on pump laser intensity, but independent of ambient temperature. They provide a physical interpretation of the observed light-induced collective Mn-spin precession and relaxation.