Femtosecond demagnetization and hot-hole relaxation in ferromagnetic Ga1-xMnxAs

被引：35
|
作者：
Wang, J. [1 ]
Cywinski, L. [2 ]
Sun, C. [1 ]
Kono, J. [1 ]
Munekata, H. [3 ]
Sham, L. J. [2 ]
机构：
[1] Rice Univ, Dept Elect & Comp Engn, Houston, TX 77005 USA
[2] Univ Calif San Diego, Dept Phys, La Jolla, CA 92093 USA
[3] Tokyo Inst Technol, Imaging Sci & Engn Lab, Kanagawa 2268503, Japan
来源：
PHYSICAL REVIEW B | 2008年 / 77卷 / 23期
基金：
美国国家科学基金会;
关键词：
D O I：
10.1103/PhysRevB.77.235308
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We have studied ultrafast photoinduced demagnetization in GaMnAs via two-color time-resolved magneto-optical Kerr spectroscopy. Below band gap midinfrared pump pulses strongly excite the valence band, while near-infrared probe pulses reveal subpicosecond demagnetization that is followed by an ultrafast (similar to 1 ps) partial recovery of the Kerr signal. Through comparison with InMnAs, we attribute the signal recovery to an ultrafast energy relaxation of holes. We propose that the dynamical polarization of holes through p-d scattering is the source of the observed probe signal. These results support the physical picture of femtosecond demagnetization proposed earlier for InMnAs, identifying the critical roles of both energy and spin relaxation of hot holes.
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页数：6
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