scholarly journals Ultrafast supercontinuum fiber-laser based pump-probe scanning magneto-optical Kerr effect microscope for the investigation of electron spin dynamics in semiconductors at cryogenic temperatures with picosecond time and micrometer spatial resolution

2013 ◽  
Vol 84 (12) ◽  
pp. 123903 ◽  
Author(s):  
T. Henn ◽  
T. Kiessling ◽  
W. Ossau ◽  
L. W. Molenkamp ◽  
K. Biermann ◽  
...  
Keyword(s):  
Fiber Laser ◽  
Spatial Resolution ◽  
Electron Spin ◽  
Kerr Effect ◽  
Spin Dynamics ◽  
Optical Kerr Effect ◽  
Cryogenic Temperatures ◽  
Pump Probe ◽  
Magneto Optical Kerr Effect ◽  
Electron Spin Dynamics

ULTRAFAST ELECTRON SPIN DYNAMICS OF AS-GROWN Ga1-xMnxAs WITH APPROPRIATE Mn DOPING

2013 ◽  
Vol 27 (16) ◽  
pp. 1350124
Author(s):  
HAN YUE
Keyword(s):  
Electron Spin ◽  
Kerr Effect ◽  
Spin Dynamics ◽  
Optical Kerr Effect ◽  
Time Resolved ◽  
Electron Spin Relaxation ◽  
Mn Doping ◽  
Magneto Optical Kerr Effect ◽  
Exchange Scattering ◽  
Electron Spin Dynamics

The electron spin dynamics in the as-grown Ga 1-x Mn x As films with appropriate Mn doping of x ~ 2–5% is studied using time-resolved magneto-optical Kerr effect measurements. Due to the existence of Mn interstitials, the s-d exchange scattering is found to play an important role for the as-grown Ga 1-x Mn x As , and compete with p-d exchange coupling to dominate the electron spin relaxation process. The contribution of electron–electron Coulomb scattering to the electron spin dynamics for the as-grown Ga 1-x Mn x As appears to be as important as that of the annealed ones. Our findings are fundamentally important for better understanding the electron spin dynamics in Ga 1-x Mn x As for its future spintronic applications.

Ultrafast spin dynamics in InP probed by the photo-induced magneto-optical Kerr effect

2003 ◽  
Vol 0 (5) ◽  
pp. 1527-1531 ◽  
Author(s):  
A. V. Kimel ◽  
A. A. Tsvetkov ◽  
A. Kirilyuk ◽  
V. N. Gridnev ◽  
Th. Rasing
Keyword(s):  
Kerr Effect ◽  
Spin Dynamics ◽  
Optical Kerr Effect ◽  
Magneto Optical Kerr Effect

scholarly journals Room-temperature ultrafast carrier and spin dynamics in GaAs probed by the photoinduced magneto-optical Kerr effect

2001 ◽  
Vol 63 (23) ◽  
Author(s):  
A. V. Kimel ◽  
F. Bentivegna ◽  
V. N. Gridnev ◽  
V. V. Pavlov ◽  
R. V. Pisarev ◽  
...  
Keyword(s):  
Kerr Effect ◽  
Room Temperature ◽  
Spin Dynamics ◽  
Optical Kerr Effect ◽  
Ultrafast Carrier ◽  
Magneto Optical Kerr Effect

scholarly journals Quasi-Static Strain Governing Ultrafast Spin Dynamics

2021 ◽  
Author(s):  
Yooleemi Shin ◽  
Mircea Vomir ◽  
Dong-Hyun Kim ◽  
Phuoc Van ◽  
Jong-Ryul Jeong ◽  
...  
Keyword(s):  
Thermal Effects ◽  
Kerr Effect ◽  
Spin Dynamics ◽  
Optical Kerr Effect ◽  
Energy Term ◽  
Lattice Thermal Expansion ◽  
Static Strain ◽  
Magnetoelastic Energy ◽  
Sagnac Interferometry ◽  
Magneto Optical Kerr Effect

Abstract The quasi-static strain (QSS) is the product induced by the lattice thermal expansion after ultrafast photo-excitation. Although the QSS and thermal effects are barely distinguishable in time, they should be treated separately because of their different fundamental actions to ultrafast spin dynamics. By employing ultrafast Sagnac interferometry and the magneto-optical Kerr effect, we demonstrate quantitatively the existence of QSS and the decoupling of two effects counteracting each other in typical polycrystalline Co and Ni films. The Landau-Lifshitz-Gilbert and Kittel equations considering a magnetoelastic energy term showed that QSS, rather than the thermal energy, in ferromagnets plays a governing role in ultrafast spin dynamics. This demonstration provides an essential way to analyze ultrafast photo-induced phenomena.

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