Journal
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
Volume 53, Issue 5, Pages 779-782Publisher
SCIENCE PRESS
DOI: 10.1007/s11433-010-0196-9
Keywords
dilute magnetic semiconductor; magneto-crystalline anisotropy; time-resolved Kerr rotation; coherent precession
Categories
Funding
- National Basic Research Program of China [2006CB932801, 2007CB924903, 2007CB924904]
- Chinese Academy of Sciences [KJCX.YW.W09]
- National Natural Science Foundation of China [60836002, 10674130, 60521001]
Ask authors/readers for more resources
We report that, by linearly polarized pumping of different wavelengths, Kerr transients appear at zero magnetic field only in the case when GaMnAs samples are initialized at 3 K by first applying a 0.8 Tesla field and then returning to zero field. We find that, instead of magnetization precession, the near-band gap excitation induces a coherent out-of-plane turning of magnetization, which shows very long relaxation dynamics with no precession. When photon energy increases, the peak value of the Kerr transient increases, but it decays rapidly to the original slow transient seen under the near-band-gap excitation.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available